stau.space
C++ Standard Template Library browser.
first commit
+1960
+10
.clang-format
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.clang-format
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Makefile
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Makefile
···
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.POSIX:
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CXX=g++
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WARNINGS=-Werror -Wall -Wextra
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CXXFLAGS=-std=c++2b $(WARNINGS)
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SRC=src/*.cpp
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HEADERS=src/*.hpp
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BUILD=build
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build: src/main.cpp
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$(CXX) $(SRC) -g -o $(BUILD)/a.out $(CXXFLAGS)
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run: build
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./$(BUILD)/a.out $(ARGS)
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test:
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./$(BUILD)/a.out $(ARGS)
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format:
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clang-format -i $(SRC) $(HEADERS)
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.PHONY: build run format
+1426
basic_ifstream.html
+1426
basic_ifstream.html
···
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<tr class="t-nv"><td colspan="5"><a href="../thread.html" title="cpp/thread">Concurrency support library</a> <span class="t-mark-rev t-since-cxx11">(C++11)</span></td></tr>
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<tr class="t-nv"><td colspan="5"><a href="../experimental.html" title="cpp/experimental">Technical specifications</a></td></tr>
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<tr class="t-nv"><td colspan="5"><a href="../symbol_index.html" title="cpp/symbol index">Symbols index</a></td></tr>
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<tr class="t-nv"><td colspan="5"><a href="../links/libs.html" title="cpp/links/libs">External libraries</a></td></tr>
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</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../io.html" title="cpp/io"> Input/output library</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
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<tr class="t-nv"><td colspan="5"> <a href="manip.html" title="cpp/io/manip"> I/O manipulators</a></td></tr>
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<tr class="t-nv"><td colspan="5"> <a href="../io.html#Print_functions_.28since_C.2B.2B23.29" title="cpp/io"> Print functions</a> <span class="t-mark-rev t-since-cxx23">(C++23)</span></td></tr>
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<tr class="t-nv"><td colspan="5"> <a href="c.html" title="cpp/io/c"> C-style I/O</a></td></tr>
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<tr class="t-nv-h1"><td colspan="5"> Buffers</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_streambuf.html" title="cpp/io/basic streambuf"><span class="t-lines"><span>basic_streambuf</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_filebuf.html" title="cpp/io/basic filebuf"><span class="t-lines"><span>basic_filebuf</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_stringbuf.html" title="cpp/io/basic stringbuf"><span class="t-lines"><span>basic_stringbuf</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_spanbuf.html" title="cpp/io/basic spanbuf"><span class="t-lines"><span>basic_spanbuf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="strstreambuf.html" title="cpp/io/strstreambuf"><span class="t-lines"><span>strstreambuf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_syncbuf.html" title="cpp/io/basic syncbuf"><span class="t-lines"><span>basic_syncbuf</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h1"><td colspan="5"> Streams</td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Abstractions</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ios_base.html" title="cpp/io/ios base"><span class="t-lines"><span>ios_base</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ios.html" title="cpp/io/basic ios"><span class="t-lines"><span>basic_ios</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_istream.html" title="cpp/io/basic istream"><span class="t-lines"><span>basic_istream</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ostream.html" title="cpp/io/basic ostream"><span class="t-lines"><span>basic_ostream</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_iostream.html" title="cpp/io/basic iostream"><span class="t-lines"><span>basic_iostream</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> File I/O</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>basic_ifstream</span></span></strong></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ofstream.html" title="cpp/io/basic ofstream"><span class="t-lines"><span>basic_ofstream</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_fstream.html" title="cpp/io/basic fstream"><span class="t-lines"><span>basic_fstream</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> String I/O</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_istringstream.html" title="cpp/io/basic istringstream"><span class="t-lines"><span>basic_istringstream</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ostringstream.html" title="cpp/io/basic ostringstream"><span class="t-lines"><span>basic_ostringstream</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_stringstream.html" title="cpp/io/basic stringstream"><span class="t-lines"><span>basic_stringstream</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Array I/O</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ispanstream.html" title="cpp/io/basic ispanstream"><span class="t-lines"><span>basic_ispanstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ospanstream.html" title="cpp/io/basic ospanstream"><span class="t-lines"><span>basic_ospanstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_spanstream.html" title="cpp/io/basic spanstream"><span class="t-lines"><span>basic_spanstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="istrstream.html" title="cpp/io/istrstream"><span class="t-lines"><span>istrstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ostrstream.html" title="cpp/io/ostrstream"><span class="t-lines"><span>ostrstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="strstream.html" title="cpp/io/strstream"><span class="t-lines"><span>strstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx98">(deprecated in C++98)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Synchronized Output</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_osyncstream.html" title="cpp/io/basic osyncstream"><span class="t-lines"><span>basic_osyncstream</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h1"><td colspan="5"> Types</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="streamoff.html" title="cpp/io/streamoff"><span class="t-lines"><span>streamoff</span></span></a></div></div></td></tr>
339
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="streamsize.html" title="cpp/io/streamsize"><span class="t-lines"><span>streamsize</span></span></a></div></div></td></tr>
340
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="fpos.html" title="cpp/io/fpos"><span class="t-lines"><span>fpos</span></span></a></div></div></td></tr>
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<tr class="t-nv-h1"><td colspan="5"> Error category interface</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="iostream_category.html" title="cpp/io/iostream category"><span class="t-lines"><span>iostream_category</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
343
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="io_errc.html" title="cpp/io/io errc"><span class="t-lines"><span>io_errc</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
344
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</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"><tt>std::basic_ifstream</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
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<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/basic_ifstream.html" title="cpp/io/basic ifstream/basic ifstream"><span class="t-lines"><span>basic_ifstream::basic_ifstream</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/operator=.html" title="cpp/io/basic ifstream/operator="><span class="t-lines"><span>basic_ifstream::operator=</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/swap.html" title="cpp/io/basic ifstream/swap"><span class="t-lines"><span>basic_ifstream::swap</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/rdbuf.html" title="cpp/io/basic ifstream/rdbuf"><span class="t-lines"><span>basic_ifstream::rdbuf</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/native_handle.html" title="cpp/io/basic ifstream/native handle"><span class="t-lines"><span>basic_ifstream::native_handle</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx26">(C++26)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> File operations </td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/is_open.html" title="cpp/io/basic ifstream/is open"><span class="t-lines"><span>basic_ifstream::is_open</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/open.html" title="cpp/io/basic ifstream/open"><span class="t-lines"><span>basic_ifstream::open</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/close.html" title="cpp/io/basic ifstream/close"><span class="t-lines"><span>basic_ifstream::close</span></span></a></div></div></td></tr>
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<tr class="t-nv-h1"><td colspan="5"> Non-member functions </td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="basic_ifstream/swap2.html" title="cpp/io/basic ifstream/swap2"><span class="t-lines"><span>swap<span class="t-dsc-small">(std::basic_ifstream)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ifstream/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
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<table class="t-dcl-begin"><tbody>
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<tr class="t-dsc-header">
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<td> <div>Defined in header <code><a href="../header/fstream.html" title="cpp/header/fstream"><fstream></a></code>
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</div></td>
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<td></td>
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<td></td>
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</tr>
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<tr class="t-dcl">
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<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <br />
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<p>    <span class="kw1">class</span> CharT, <br />
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    <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="../string/char_traits.html"><span class="kw1270">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span><br />
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</p>
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<span class="sy1">></span> <span class="kw1">class</span> basic_ifstream <span class="sy4">:</span> <span class="kw1">public</span> <a href="basic_istream.html"><span class="kw1717">std::<span class="me2">basic_istream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span></span></div></td>
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<td class="t-dcl-nopad"> </td>
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<td class="t-dcl-nopad"> </td>
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</tr>
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<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
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</tbody></table>
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<p>The class template <code>basic_ifstream</code> implements high-level input operations on file-based streams. It interfaces a file-based streambuffer (<span class="t-lc"><a href="basic_filebuf.html" title="cpp/io/basic filebuf">std::basic_filebuf</a></span>) with the high-level interface of (<span class="t-lc"><a href="basic_istream.html" title="cpp/io/basic istream">std::basic_istream</a></span>).
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</p><p>A typical implementation of <code>std::basic_ifstream</code> holds only one non-derived data member: an instance of <span class="mw-geshi cpp source-cpp"><a href="basic_filebuf.html"><span class="kw1671">std::<span class="me2">basic_filebuf</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span></span>.
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</p>
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<div class="t-inheritance-diagram">
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<div class="center"><div class="noresize"><map name="ImageMap_1_1582003816"><area href="ios_base.html" shape="rect" coords="5,6,107,39" alt="cpp/io/ios base" title="cpp/io/ios base"/><area href="basic_ios.html" shape="rect" coords="135,4,252,42" alt="cpp/io/basic ios" title="cpp/io/basic ios"/><area href="basic_istream.html" shape="rect" coords="278,4,395,42" alt="cpp/io/basic istream" title="cpp/io/basic istream"/></map><img alt="std-basic ifstream-inheritance.svg" src="../../../../upload.cppreference.com/mwiki/images/7/79/std-basic_ifstream-inheritance.svg" width="543" height="45" usemap="#ImageMap_1_1582003816"/></div></div>
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<div style="text-align:center;">
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<p><span style="font-size:0.7em; line-height:130%">Inheritance diagram</span>
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</p>
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</div>
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</div>
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<p>Several typedefs for common character types are provided:
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</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-header">
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<td colspan="2"> <div>Defined in header <code><a href="../header/fstream.html" title="cpp/header/fstream"><fstream></a></code> </div>
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</td></tr>
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<tr class="t-dsc-hitem">
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<td> Type
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</td>
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<td> Definition
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</td></tr>
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+
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<tr class="t-dsc">
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<td> <code>std::ifstream</code>
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</td>
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<td> <span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ifstream</span><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span></span>
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</td></tr>
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+
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+
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<tr class="t-dsc">
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<td> <code>std::wifstream</code>
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</td>
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<td> <span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">basic_ifstream</span><span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span></span>
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</td></tr>
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</table>
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<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
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<ul>
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<li class="toclevel-1"><a href="basic_ifstream.html#Member_types"><span class="tocnumber">1</span> <span class="toctext">Member types</span></a></li>
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<li class="toclevel-1 tocsection-1"><a href="basic_ifstream.html#Member_functions"><span class="tocnumber">2</span> <span class="toctext">Member functions</span></a>
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<ul>
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<li class="toclevel-2"><a href="basic_ifstream.html#File_operations"><span class="tocnumber">2.1</span> <span class="toctext">File operations</span></a></li>
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</ul>
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</li>
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<li class="toclevel-1 tocsection-2"><a href="basic_ifstream.html#Non-member_functions"><span class="tocnumber">3</span> <span class="toctext">Non-member functions</span></a></li>
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<li class="toclevel-1"><a href="basic_ifstream.html#Inherited_from_std::basic_istream"><span class="tocnumber">4</span> <span class="toctext">Inherited from <span>std::</span>basic_istream</span></a>
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<ul>
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<li class="toclevel-2"><a href="basic_ifstream.html#Member_functions_2"><span class="tocnumber">4.1</span> <span class="toctext">Member functions</span></a>
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<ul>
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<li class="toclevel-3"><a href="basic_ifstream.html#Formatted_input"><span class="tocnumber">4.1.1</span> <span class="toctext">Formatted input</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Unformatted_input"><span class="tocnumber">4.1.2</span> <span class="toctext">Unformatted input</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Positioning"><span class="tocnumber">4.1.3</span> <span class="toctext">Positioning</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Miscellaneous"><span class="tocnumber">4.1.4</span> <span class="toctext">Miscellaneous</span></a></li>
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</ul>
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</li>
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<li class="toclevel-2"><a href="basic_ifstream.html#Member_classes"><span class="tocnumber">4.2</span> <span class="toctext">Member classes</span></a></li>
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</ul>
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</li>
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<li class="toclevel-1"><a href="basic_ifstream.html#Inherited_from_std::basic_ios"><span class="tocnumber">5</span> <span class="toctext">Inherited from <span>std::</span>basic_ios</span></a>
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<ul>
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<li class="toclevel-2"><a href="basic_ifstream.html#Member_types_2"><span class="tocnumber">5.1</span> <span class="toctext">Member types</span></a></li>
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<li class="toclevel-2"><a href="basic_ifstream.html#Member_functions_3"><span class="tocnumber">5.2</span> <span class="toctext">Member functions</span></a>
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<ul>
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<li class="toclevel-3"><a href="basic_ifstream.html#State_functions"><span class="tocnumber">5.2.1</span> <span class="toctext">State functions</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Formatting"><span class="tocnumber">5.2.2</span> <span class="toctext">Formatting</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Miscellaneous_2"><span class="tocnumber">5.2.3</span> <span class="toctext">Miscellaneous</span></a></li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="toclevel-1"><a href="basic_ifstream.html#Inherited_from_std::ios_base"><span class="tocnumber">6</span> <span class="toctext">Inherited from <span>std::</span>ios_base</span></a>
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<li class="toclevel-3"><a href="basic_ifstream.html#Locales"><span class="tocnumber">6.1.2</span> <span class="toctext">Locales</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Internal_extensible_array"><span class="tocnumber">6.1.3</span> <span class="toctext">Internal extensible array</span></a></li>
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<li class="toclevel-3"><a href="basic_ifstream.html#Member_classes_2"><span class="tocnumber">6.1.5</span> <span class="toctext">Member classes</span></a></li>
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<li class="toclevel-2"><a href="basic_ifstream.html#Member_types_and_constants"><span class="tocnumber">6.2</span> <span class="toctext">Member types and constants</span></a></li>
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<li class="toclevel-2 tocsection-3"><a href="basic_ifstream.html#Notes"><span class="tocnumber">6.3</span> <span class="toctext">Notes</span></a></li>
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<li class="toclevel-2 tocsection-4"><a href="basic_ifstream.html#Example"><span class="tocnumber">6.4</span> <span class="toctext">Example</span></a></li>
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<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/member_types&action=edit&section=T-1" title="Template:cpp/io/member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span></h3>
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<td> <code>traits_type</code>
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<td> <code>Traits</code>; the program is ill-formed if <code>Traits::char_type</code> is not <code>CharT</code>.<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_traits_type&action=edit">[edit]</a></span>
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<td> <code>int_type</code>
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<td> <code>off_type</code>
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<td> <code>native_handle_type</code><span class="t-mark-rev t-since-cxx26">(C++26)</span>
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<td> <i>implementation-defined</i> type that is <a href="../named_req/TriviallyCopyable.html" title="cpp/named req/TriviallyCopyable"><span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">TriviallyCopyable</span></a> and <a href="../concepts/semiregular.html" title="cpp/concepts/semiregular"><code>semiregular</code></a><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/dsc_native_handle_type&action=edit">[edit]</a></span>
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<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&action=edit&section=1" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span></h3>
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<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="basic_ifstream/basic_ifstream.html" title="cpp/io/basic ifstream/basic ifstream"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
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<td> constructs the file stream <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_constructor&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><span class="t-lines"><span>(destructor)</span></span></div><div><span class="t-lines"><span><span class="t-cmark">[virtual]</span> <span class="t-mark">(implicitly declared)</span></span></span></div></div>
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<td> destructs the <code>basic_ifstream</code> and the associated buffer, closes the file <br /> <span class="t-mark">(virtual public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_destructor&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/operator=.html" title="cpp/io/basic ifstream/operator="> <span class="t-lines"><span>operator=</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
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</td>
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<td> moves the file stream <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_operator%3D&action=edit">[edit]</a></span>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/swap.html" title="cpp/io/basic ifstream/swap"> <span class="t-lines"><span>swap</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
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</td>
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<td> swaps two file streams <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_swap&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/rdbuf.html" title="cpp/io/basic ifstream/rdbuf"> <span class="t-lines"><span>rdbuf</span></span></a></div></div>
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</td>
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<td> returns the underlying raw file device object <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_rdbuf&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/native_handle.html" title="cpp/io/basic ifstream/native handle"> <span class="t-lines"><span>native_handle</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx26">(C++26)</span></span></span></div></div>
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</td>
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<td> returns the underlying implementation-defined handle <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ifstream/dsc_native_handle&action=edit">[edit]</a></span>
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<td colspan="2"> <h5> <span class="mw-headline" id="File_operations"> File operations </span></h5>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/is_open.html" title="cpp/io/basic ifstream/is open"> <span class="t-lines"><span>is_open</span></span></a></div></div>
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</td>
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<td> checks if the stream has an associated file <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_is_open&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/open.html" title="cpp/io/basic ifstream/open"> <span class="t-lines"><span>open</span></span></a></div></div>
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</td>
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<td> opens a file and associates it with the stream <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_open&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/close.html" title="cpp/io/basic ifstream/close"> <span class="t-lines"><span>close</span></span></a></div></div>
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</td>
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<td> closes the associated file <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_close&action=edit">[edit]</a></span>
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<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&action=edit&section=2" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span></h3>
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<td> <div class="t-dsc-member-div"><div><a href="basic_ifstream/swap2.html" title="cpp/io/basic ifstream/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::basic_ifstream)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
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</td>
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<td> specializes the <span class="t-lc"><a href="../algorithm/swap.html" title="cpp/algorithm/swap">std::swap</a></span> algorithm <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_fstream/dsc_swap2&action=edit">[edit]</a></span>
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<div class="t-inherited">
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<h2> <span class="mw-headline" id="Inherited_from_std::basic_istream">Inherited from <a href="basic_istream.html" title="cpp/io/basic istream"> <span style="font-size:0.7em; line-height:130%">std::</span>basic_istream</a> </span></h2>
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<h3> <span class="mw-headline" id="Member_functions_2">Member functions</span></h3>
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<td colspan="2"> <h5> <span class="mw-headline" id="Formatted_input"> Formatted input </span></h5>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/operator_gtgt.html" title="cpp/io/basic istream/operator gtgt"> <span class="t-lines"><span>operator>></span></span></a></div></div>
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</td>
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<td> extracts formatted data <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_operator_gtgt&action=edit">[edit]</a></span>
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<td colspan="2"> <h5> <span class="mw-headline" id="Unformatted_input"> Unformatted input </span></h5>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/get.html" title="cpp/io/basic istream/get"> <span class="t-lines"><span>get</span></span></a></div></div>
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</td>
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<td> extracts characters <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_get&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/peek.html" title="cpp/io/basic istream/peek"> <span class="t-lines"><span>peek</span></span></a></div></div>
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</td>
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<td> reads the next character without extracting it <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_peek&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/unget.html" title="cpp/io/basic istream/unget"> <span class="t-lines"><span>unget</span></span></a></div></div>
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<td> unextracts a character <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_unget&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/putback.html" title="cpp/io/basic istream/putback"> <span class="t-lines"><span>putback</span></span></a></div></div>
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<td> puts a character into input stream <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_putback&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/getline.html" title="cpp/io/basic istream/getline"> <span class="t-lines"><span>getline</span></span></a></div></div>
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</td>
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<td> extracts characters until the given character is found <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_getline&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/ignore.html" title="cpp/io/basic istream/ignore"> <span class="t-lines"><span>ignore</span></span></a></div></div>
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<td> extracts and discards characters until the given character is found <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_ignore&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/read.html" title="cpp/io/basic istream/read"> <span class="t-lines"><span>read</span></span></a></div></div>
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<td> extracts blocks of characters <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_read&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/readsome.html" title="cpp/io/basic istream/readsome"> <span class="t-lines"><span>readsome</span></span></a></div></div>
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</td>
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<td> extracts already available blocks of characters <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_readsome&action=edit">[edit]</a></span>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/gcount.html" title="cpp/io/basic istream/gcount"> <span class="t-lines"><span>gcount</span></span></a></div></div>
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<td> returns number of characters extracted by last unformatted input operation <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_gcount&action=edit">[edit]</a></span>
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<td colspan="2"> <h5> <span class="mw-headline" id="Positioning"> Positioning </span></h5>
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<td> <div class="t-dsc-member-div"><div><a href="basic_istream/tellg.html" title="cpp/io/basic istream/tellg"> <span class="t-lines"><span>tellg</span></span></a></div></div>
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<td> returns the input position indicator <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_tellg&action=edit">[edit]</a></span>
667
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</td></tr>
668
+
669
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<tr class="t-dsc">
670
+
<td> <div class="t-dsc-member-div"><div><a href="basic_istream/seekg.html" title="cpp/io/basic istream/seekg"> <span class="t-lines"><span>seekg</span></span></a></div></div>
671
+
</td>
672
+
<td> sets the input position indicator <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_seekg&action=edit">[edit]</a></span>
673
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</td></tr>
674
+
675
+
676
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<tr>
677
+
<td colspan="2"> <h5> <span class="mw-headline" id="Miscellaneous"> Miscellaneous </span></h5>
678
+
</td></tr>
679
+
680
+
<tr class="t-dsc">
681
+
<td> <div class="t-dsc-member-div"><div><a href="basic_istream/sync.html" title="cpp/io/basic istream/sync"> <span class="t-lines"><span>sync</span></span></a></div></div>
682
+
</td>
683
+
<td> synchronizes with the underlying storage device <br /> <span class="t-mark">(public member function of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_sync&action=edit">[edit]</a></span>
684
+
</td></tr>
685
+
</table>
686
+
<h3> <span class="mw-headline" id="Member_classes">Member classes</span></h3>
687
+
<table class="t-dsc-begin">
688
+
689
+
<tr class="t-dsc">
690
+
<td> <div class="t-dsc-member-div"><div><a href="basic_istream/sentry.html" title="cpp/io/basic istream/sentry"> <span class="t-lines"><span>sentry</span></span></a></div></div>
691
+
</td>
692
+
<td> implements basic logic for preparation of the stream for input operations <br /> <span class="t-mark">(public member class of <code>std::basic_istream<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_istream/dsc_sentry&action=edit">[edit]</a></span>
693
+
</td></tr>
694
+
</table>
695
+
</div>
696
+
<div class="t-inherited">
697
+
<h2> <span class="mw-headline" id="Inherited_from_std::basic_ios">Inherited from <a href="basic_ios.html" title="cpp/io/basic ios"> <span style="font-size:0.7em; line-height:130%">std::</span>basic_ios</a> </span></h2>
698
+
<h3> <span class="mw-headline" id="Member_types_2">Member types</span></h3>
699
+
<table class="t-dsc-begin">
700
+
701
+
<tr class="t-dsc-hitem">
702
+
<td> Member type
703
+
</td>
704
+
<td> Definition
705
+
</td></tr>
706
+
707
+
708
+
<tr class="t-dsc">
709
+
<td> <code>char_type</code>
710
+
</td>
711
+
<td> <code>CharT</code>
712
+
</td></tr>
713
+
714
+
715
+
<tr class="t-dsc">
716
+
<td> <code>traits_type</code>
717
+
</td>
718
+
<td> <code>Traits</code>
719
+
</td></tr>
720
+
721
+
722
+
<tr class="t-dsc">
723
+
<td> <code>int_type</code>
724
+
</td>
725
+
<td> <code>Traits::int_type</code>
726
+
</td></tr>
727
+
728
+
729
+
<tr class="t-dsc">
730
+
<td> <code>pos_type</code>
731
+
</td>
732
+
<td> <code>Traits::pos_type</code>
733
+
</td></tr>
734
+
735
+
736
+
<tr class="t-dsc">
737
+
<td> <code>off_type</code>
738
+
</td>
739
+
<td> <code>Traits::off_type</code>
740
+
</td></tr>
741
+
742
+
</table>
743
+
<h3> <span class="mw-headline" id="Member_functions_3">Member functions</span></h3>
744
+
<table class="t-dsc-begin">
745
+
746
+
<tr>
747
+
<td colspan="2"> <h5> <span class="mw-headline" id="State_functions"> State functions </span></h5>
748
+
</td></tr>
749
+
750
+
<tr class="t-dsc">
751
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/good.html" title="cpp/io/basic ios/good"> <span class="t-lines"><span>good</span></span></a></div></div>
752
+
</td>
753
+
<td> checks if no error has occurred i.e. I/O operations are available <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_good&action=edit">[edit]</a></span>
754
+
</td></tr>
755
+
756
+
<tr class="t-dsc">
757
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/eof.html" title="cpp/io/basic ios/eof"> <span class="t-lines"><span>eof</span></span></a></div></div>
758
+
</td>
759
+
<td> checks if end-of-file has been reached <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_eof&action=edit">[edit]</a></span>
760
+
</td></tr>
761
+
762
+
<tr class="t-dsc">
763
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/fail.html" title="cpp/io/basic ios/fail"> <span class="t-lines"><span>fail</span></span></a></div></div>
764
+
</td>
765
+
<td> checks if an error has occurred <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_fail&action=edit">[edit]</a></span>
766
+
</td></tr>
767
+
768
+
<tr class="t-dsc">
769
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/bad.html" title="cpp/io/basic ios/bad"> <span class="t-lines"><span>bad</span></span></a></div></div>
770
+
</td>
771
+
<td> checks if a non-recoverable error has occurred <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_bad&action=edit">[edit]</a></span>
772
+
</td></tr>
773
+
774
+
<tr class="t-dsc">
775
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/operator!.html" title="cpp/io/basic ios/operator!"> <span class="t-lines"><span>operator!</span></span></a></div></div>
776
+
</td>
777
+
<td> checks if an error has occurred (synonym of <span class="t-lc"><a href="basic_ios/fail.html" title="cpp/io/basic ios/fail">fail()</a></span>) <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_operator!&action=edit">[edit]</a></span>
778
+
</td></tr>
779
+
780
+
<tr class="t-dsc">
781
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/operator_bool.html" title="cpp/io/basic ios/operator bool"> <span class="t-lines"><span>operator bool</span></span></a></div></div>
782
+
</td>
783
+
<td> checks if no error has occurred (synonym of <code>!</code><span class="t-lc"><a href="basic_ios/fail.html" title="cpp/io/basic ios/fail">fail()</a></span>) <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_operator_bool&action=edit">[edit]</a></span>
784
+
</td></tr>
785
+
786
+
<tr class="t-dsc">
787
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/rdstate.html" title="cpp/io/basic ios/rdstate"> <span class="t-lines"><span>rdstate</span></span></a></div></div>
788
+
</td>
789
+
<td> returns state flags <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_rdstate&action=edit">[edit]</a></span>
790
+
</td></tr>
791
+
792
+
<tr class="t-dsc">
793
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/setstate.html" title="cpp/io/basic ios/setstate"> <span class="t-lines"><span>setstate</span></span></a></div></div>
794
+
</td>
795
+
<td> sets state flags <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_setstate&action=edit">[edit]</a></span>
796
+
</td></tr>
797
+
798
+
<tr class="t-dsc">
799
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/clear.html" title="cpp/io/basic ios/clear"> <span class="t-lines"><span>clear</span></span></a></div></div>
800
+
</td>
801
+
<td> modifies state flags <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_clear&action=edit">[edit]</a></span>
802
+
</td></tr>
803
+
804
+
805
+
<tr>
806
+
<td colspan="2"> <h5> <span class="mw-headline" id="Formatting"> Formatting </span></h5>
807
+
</td></tr>
808
+
809
+
<tr class="t-dsc">
810
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/copyfmt.html" title="cpp/io/basic ios/copyfmt"> <span class="t-lines"><span>copyfmt</span></span></a></div></div>
811
+
</td>
812
+
<td> copies formatting information <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_copyfmt&action=edit">[edit]</a></span>
813
+
</td></tr>
814
+
815
+
<tr class="t-dsc">
816
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/fill.html" title="cpp/io/basic ios/fill"> <span class="t-lines"><span>fill</span></span></a></div></div>
817
+
</td>
818
+
<td> manages the fill character <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_fill&action=edit">[edit]</a></span>
819
+
</td></tr>
820
+
821
+
822
+
<tr>
823
+
<td colspan="2"> <h5> <span class="mw-headline" id="Miscellaneous_2"> Miscellaneous </span></h5>
824
+
</td></tr>
825
+
826
+
<tr class="t-dsc">
827
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/exceptions.html" title="cpp/io/basic ios/exceptions"> <span class="t-lines"><span>exceptions</span></span></a></div></div>
828
+
</td>
829
+
<td> manages exception mask <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_exceptions&action=edit">[edit]</a></span>
830
+
</td></tr>
831
+
832
+
<tr class="t-dsc">
833
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/imbue.html" title="cpp/io/basic ios/imbue"> <span class="t-lines"><span>imbue</span></span></a></div></div>
834
+
</td>
835
+
<td> sets the locale <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_imbue&action=edit">[edit]</a></span>
836
+
</td></tr>
837
+
838
+
<tr class="t-dsc">
839
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/rdbuf.html" title="cpp/io/basic ios/rdbuf"> <span class="t-lines"><span>rdbuf</span></span></a></div></div>
840
+
</td>
841
+
<td> manages associated stream buffer <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_rdbuf&action=edit">[edit]</a></span>
842
+
</td></tr>
843
+
844
+
<tr class="t-dsc">
845
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/tie.html" title="cpp/io/basic ios/tie"> <span class="t-lines"><span>tie</span></span></a></div></div>
846
+
</td>
847
+
<td> manages tied stream <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_tie&action=edit">[edit]</a></span>
848
+
</td></tr>
849
+
850
+
<tr class="t-dsc">
851
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/narrow.html" title="cpp/io/basic ios/narrow"> <span class="t-lines"><span>narrow</span></span></a></div></div>
852
+
</td>
853
+
<td> narrows characters <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_narrow&action=edit">[edit]</a></span>
854
+
</td></tr>
855
+
856
+
<tr class="t-dsc">
857
+
<td> <div class="t-dsc-member-div"><div><a href="basic_ios/widen.html" title="cpp/io/basic ios/widen"> <span class="t-lines"><span>widen</span></span></a></div></div>
858
+
</td>
859
+
<td> widens characters <br /> <span class="t-mark">(public member function of <code>std::basic_ios<CharT,Traits></code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/basic_ios/dsc_widen&action=edit">[edit]</a></span>
860
+
</td></tr>
861
+
</table>
862
+
</div>
863
+
<div class="t-inherited">
864
+
<h2> <span class="mw-headline" id="Inherited_from_std::ios_base">Inherited from <a href="ios_base.html" title="cpp/io/ios base"> <span style="font-size:0.7em; line-height:130%">std::</span>ios_base</a> </span></h2>
865
+
<h3> <span class="mw-headline" id="Member_functions_4">Member functions</span></h3>
866
+
<table class="t-dsc-begin">
867
+
868
+
869
+
<tr>
870
+
<td colspan="2"> <h5> <span class="mw-headline" id="Formatting_2"> Formatting </span></h5>
871
+
</td></tr>
872
+
873
+
<tr class="t-dsc">
874
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/flags.html" title="cpp/io/ios base/flags"> <span class="t-lines"><span>flags</span></span></a></div></div>
875
+
</td>
876
+
<td> manages format flags <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_flags&action=edit">[edit]</a></span>
877
+
</td></tr>
878
+
879
+
<tr class="t-dsc">
880
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/setf.html" title="cpp/io/ios base/setf"> <span class="t-lines"><span>setf</span></span></a></div></div>
881
+
</td>
882
+
<td> sets specific format flag <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_setf&action=edit">[edit]</a></span>
883
+
</td></tr>
884
+
885
+
<tr class="t-dsc">
886
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/unsetf.html" title="cpp/io/ios base/unsetf"> <span class="t-lines"><span>unsetf</span></span></a></div></div>
887
+
</td>
888
+
<td> clears specific format flag <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_unsetf&action=edit">[edit]</a></span>
889
+
</td></tr>
890
+
891
+
<tr class="t-dsc">
892
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/precision.html" title="cpp/io/ios base/precision"> <span class="t-lines"><span>precision</span></span></a></div></div>
893
+
</td>
894
+
<td> manages decimal precision of floating point operations <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_precision&action=edit">[edit]</a></span>
895
+
</td></tr>
896
+
897
+
<tr class="t-dsc">
898
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/width.html" title="cpp/io/ios base/width"> <span class="t-lines"><span>width</span></span></a></div></div>
899
+
</td>
900
+
<td> manages field width <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_width&action=edit">[edit]</a></span>
901
+
</td></tr>
902
+
903
+
904
+
<tr>
905
+
<td colspan="2"> <h5> <span class="mw-headline" id="Locales"> Locales </span></h5>
906
+
</td></tr>
907
+
908
+
<tr class="t-dsc">
909
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/imbue.html" title="cpp/io/ios base/imbue"> <span class="t-lines"><span>imbue</span></span></a></div></div>
910
+
</td>
911
+
<td> sets locale <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_imbue&action=edit">[edit]</a></span>
912
+
</td></tr>
913
+
914
+
<tr class="t-dsc">
915
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/getloc.html" title="cpp/io/ios base/getloc"> <span class="t-lines"><span>getloc</span></span></a></div></div>
916
+
</td>
917
+
<td> returns current locale <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_getloc&action=edit">[edit]</a></span>
918
+
</td></tr>
919
+
920
+
921
+
<tr>
922
+
<td colspan="2"> <h5> <span class="mw-headline" id="Internal_extensible_array"> Internal extensible array </span></h5>
923
+
</td></tr>
924
+
925
+
<tr class="t-dsc">
926
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/xalloc.html" title="cpp/io/ios base/xalloc"> <span class="t-lines"><span>xalloc</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div>
927
+
</td>
928
+
<td> returns a program-wide unique integer that is safe to use as index to <a href="ios_base/pword.html" title="cpp/io/ios base/pword"><tt>pword()</tt></a> and <a href="ios_base/iword.html" title="cpp/io/ios base/iword"><tt>iword()</tt></a> <br /> <span class="t-mark">(public static member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_xalloc&action=edit">[edit]</a></span>
929
+
</td></tr>
930
+
931
+
<tr class="t-dsc">
932
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/iword.html" title="cpp/io/ios base/iword"> <span class="t-lines"><span>iword</span></span></a></div></div>
933
+
</td>
934
+
<td> resizes the private storage if necessary and access to the <span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span> element at the given index <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iword&action=edit">[edit]</a></span>
935
+
</td></tr>
936
+
937
+
<tr class="t-dsc">
938
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/pword.html" title="cpp/io/ios base/pword"> <span class="t-lines"><span>pword</span></span></a></div></div>
939
+
</td>
940
+
<td> resizes the private storage if necessary and access to the <span class="mw-geshi cpp source-cpp"><span class="kw4">void</span><span class="sy2">*</span></span> element at the given index <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_pword&action=edit">[edit]</a></span>
941
+
</td></tr>
942
+
943
+
944
+
<tr>
945
+
<td colspan="2"> <h5> <span class="mw-headline" id="Miscellaneous_3"> Miscellaneous </span></h5>
946
+
</td></tr>
947
+
948
+
<tr class="t-dsc">
949
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/register_callback.html" title="cpp/io/ios base/register callback"> <span class="t-lines"><span>register_callback</span></span></a></div></div>
950
+
</td>
951
+
<td> registers event callback function <br /> <span class="t-mark">(public member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_register_callback&action=edit">[edit]</a></span>
952
+
</td></tr>
953
+
954
+
<tr class="t-dsc">
955
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/sync_with_stdio.html" title="cpp/io/ios base/sync with stdio"> <span class="t-lines"><span>sync_with_stdio</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div>
956
+
</td>
957
+
<td> sets whether C++ and C I/O libraries are interoperable <br /> <span class="t-mark">(public static member function of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_sync_with_stdio&action=edit">[edit]</a></span>
958
+
</td></tr>
959
+
960
+
961
+
<tr>
962
+
<td colspan="2"> <h5> <span class="mw-headline" id="Member_classes_2"> Member classes </span></h5>
963
+
</td></tr>
964
+
965
+
<tr class="t-dsc">
966
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/failure.html" title="cpp/io/ios base/failure"> <span class="t-lines"><span>failure</span></span></a></div></div>
967
+
</td>
968
+
<td> stream exception <br /> <span class="t-mark">(public member class of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_failure&action=edit">[edit]</a></span>
969
+
</td></tr>
970
+
971
+
<tr class="t-dsc">
972
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/Init.html" title="cpp/io/ios base/Init"> <span class="t-lines"><span>Init</span></span></a></div></div>
973
+
</td>
974
+
<td> initializes standard stream objects <br /> <span class="t-mark">(public member class of <code>std::ios_base</code>)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_Init&action=edit">[edit]</a></span>
975
+
</td></tr>
976
+
</table>
977
+
<table class="t-dsc-begin">
978
+
979
+
<tr>
980
+
<td colspan="2"> <h3> <span class="mw-headline" id="Member_types_and_constants"> Member types and constants</span></h3>
981
+
</td></tr>
982
+
983
+
<tr class="t-dsc-hitem">
984
+
<td> Type
985
+
</td>
986
+
<td> Explanation
987
+
</td></tr>
988
+
989
+
990
+
<tr class="t-dsc">
991
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"> <span class="t-lines"><span>openmode</span></span></a></div></div>
992
+
</td>
993
+
<td> stream open mode type
994
+
<p>The following constants are also defined:
995
+
</p>
996
+
<table class="t-dsc-begin">
997
+
998
+
<tr class="t-dsc-hitem">
999
+
<td> Constant
1000
+
</td>
1001
+
<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1002
+
</td></tr>
1003
+
1004
+
1005
+
<tr class="t-dsc">
1006
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>app</tt></a>
1007
+
</td>
1008
+
<td> seek to the end of stream before each write<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1009
+
</td></tr>
1010
+
1011
+
1012
+
<tr class="t-dsc">
1013
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>binary</tt></a>
1014
+
</td>
1015
+
<td> open in <a href="c/FILE.html#Binary_and_text_modes" title="cpp/io/c/FILE">binary mode</a><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1016
+
</td></tr>
1017
+
1018
+
1019
+
<tr class="t-dsc">
1020
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>in</tt></a>
1021
+
</td>
1022
+
<td> open for reading<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1023
+
</td></tr>
1024
+
1025
+
1026
+
<tr class="t-dsc">
1027
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>out</tt></a>
1028
+
</td>
1029
+
<td> open for writing<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1030
+
</td></tr>
1031
+
1032
+
1033
+
<tr class="t-dsc">
1034
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>trunc</tt></a>
1035
+
</td>
1036
+
<td> discard the contents of the stream when opening<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1037
+
</td></tr>
1038
+
1039
+
1040
+
<tr class="t-dsc">
1041
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>ate</tt></a>
1042
+
</td>
1043
+
<td> seek to the end of stream immediately after open<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1044
+
</td></tr>
1045
+
1046
+
1047
+
<tr class="t-dsc">
1048
+
<td> <a href="ios_base/openmode.html" title="cpp/io/ios base/openmode"><tt>noreplace</tt></a> <span class="t-mark-rev t-since-cxx23">(C++23)</span>
1049
+
</td>
1050
+
<td> open in exclusive mode<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1051
+
</td></tr>
1052
+
1053
+
</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_openmode&action=edit">[edit]</a></span>
1054
+
</td></tr>
1055
+
1056
+
<tr class="t-dsc">
1057
+
<td> <div class="t-dsc-member-div"><div><a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"> <span class="t-lines"><span>fmtflags</span></span></a></div></div>
1058
+
</td>
1059
+
<td> formatting flags type
1060
+
<p>The following constants are also defined:
1061
+
</p>
1062
+
<table class="t-dsc-begin">
1063
+
1064
+
<tr class="t-dsc-hitem">
1065
+
<td> Constant
1066
+
</td>
1067
+
<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1068
+
</td></tr>
1069
+
1070
+
1071
+
<tr class="t-dsc">
1072
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>dec</tt></a>
1073
+
</td>
1074
+
<td> use decimal base for integer I/O: see <span class="t-lc"><a href="manip/hex.html" title="cpp/io/manip/hex">std::dec</a></span><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1075
+
</td></tr>
1076
+
1077
+
1078
+
<tr class="t-dsc">
1079
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>oct</tt></a>
1080
+
</td>
1081
+
<td> use octal base for integer I/O: see <span class="t-lc"><a href="manip/hex.html" title="cpp/io/manip/hex">std::oct</a></span><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1082
+
</td></tr>
1083
+
1084
+
1085
+
<tr class="t-dsc">
1086
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>hex</tt></a>
1087
+
</td>
1088
+
<td> use hexadecimal base for integer I/O: see <span class="t-lc"><a href="manip/hex.html" title="cpp/io/manip/hex">std::hex</a></span><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1089
+
</td></tr>
1090
+
1091
+
1092
+
<tr class="t-dsc">
1093
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>basefield</tt></a>
1094
+
</td>
1095
+
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">dec <span class="sy3">|</span> oct <span class="sy3">|</span> hex</span></span>. Useful for masking operations<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1096
+
</td></tr>
1097
+
1098
+
1099
+
<tr class="t-dsc">
1100
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>left</tt></a>
1101
+
</td>
1102
+
<td> left adjustment (adds fill characters to the right): see <span class="t-lc"><a href="manip/left.html" title="cpp/io/manip/left">std::left</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1103
+
</td></tr>
1104
+
1105
+
1106
+
<tr class="t-dsc">
1107
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>right</tt></a>
1108
+
</td>
1109
+
<td> right adjustment (adds fill characters to the left): see <span class="t-lc"><a href="manip/left.html" title="cpp/io/manip/left">std::right</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1110
+
</td></tr>
1111
+
1112
+
1113
+
<tr class="t-dsc">
1114
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>internal</tt></a>
1115
+
</td>
1116
+
<td> internal adjustment (adds fill characters to the internal designated point): see <span class="t-lc"><a href="manip/left.html" title="cpp/io/manip/left">std::internal</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1117
+
</td></tr>
1118
+
1119
+
1120
+
<tr class="t-dsc">
1121
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>adjustfield</tt></a>
1122
+
</td>
1123
+
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">left <span class="sy3">|</span> right <span class="sy3">|</span> internal</span></span>. Useful for masking operations <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1124
+
</td></tr>
1125
+
1126
+
1127
+
<tr class="t-dsc">
1128
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>scientific</tt></a>
1129
+
</td>
1130
+
<td> generate floating point types using scientific notation, or hex notation if combined with <span class="t-c"><span class="mw-geshi cpp source-cpp">fixed</span></span>: see <span class="t-lc"><a href="manip/fixed.html" title="cpp/io/manip/fixed">std::scientific</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1131
+
</td></tr>
1132
+
1133
+
1134
+
<tr class="t-dsc">
1135
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>fixed</tt></a>
1136
+
</td>
1137
+
<td> generate floating point types using fixed notation, or hex notation if combined with <span class="t-c"><span class="mw-geshi cpp source-cpp">scientific</span></span>: see <span class="t-lc"><a href="manip/fixed.html" title="cpp/io/manip/fixed">std::fixed</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1138
+
</td></tr>
1139
+
1140
+
1141
+
<tr class="t-dsc">
1142
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>floatfield</tt></a>
1143
+
</td>
1144
+
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">scientific <span class="sy3">|</span> fixed</span></span>. Useful for masking operations <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1145
+
</td></tr>
1146
+
1147
+
1148
+
<tr class="t-dsc">
1149
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>boolalpha</tt></a>
1150
+
</td>
1151
+
<td> insert and extract <span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span> type in alphanumeric format: see <span class="t-lc"><a href="manip/boolalpha.html" title="cpp/io/manip/boolalpha">std::boolalpha</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
1152
+
</td></tr>
1153
+
1154
+
1155
+
<tr class="t-dsc">
1156
+
<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>showbase</tt></a>
1157
+
</td>
1158
+
<td> generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see <span class="t-lc"><a href="manip/showbase.html" title="cpp/io/manip/showbase">std::showbase</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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1160
+
1161
+
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<tr class="t-dsc">
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<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>showpoint</tt></a>
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+
</td>
1165
+
<td> generate a decimal-point character unconditionally for floating-point number output: see <span class="t-lc"><a href="manip/showpoint.html" title="cpp/io/manip/showpoint">std::showpoint</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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1167
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1168
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<tr class="t-dsc">
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<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>showpos</tt></a>
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</td>
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<td> generate a <span class="mw-geshi cpp source-cpp"><span class="sy2">+</span></span> character for non-negative numeric output: see <span class="t-lc"><a href="manip/showpos.html" title="cpp/io/manip/showpos">std::showpos</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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<tr class="t-dsc">
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<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>skipws</tt></a>
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</td>
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<td> skip leading whitespace before certain input operations: see <span class="t-lc"><a href="manip/skipws.html" title="cpp/io/manip/skipws">std::skipws</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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1182
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<tr class="t-dsc">
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</td>
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<td> flush the output after each output operation: see <span class="t-lc"><a href="manip/unitbuf.html" title="cpp/io/manip/unitbuf">std::unitbuf</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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</td></tr>
1188
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1189
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<tr class="t-dsc">
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<td> <a href="ios_base/fmtflags.html" title="cpp/io/ios base/fmtflags"><tt>uppercase</tt></a>
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</td>
1193
+
<td> replace certain lowercase letters with their uppercase<br />equivalents in certain output operations: see <span class="t-lc"><a href="manip/uppercase.html" title="cpp/io/manip/uppercase">std::uppercase</a></span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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</td></tr>
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</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_fmtflags&action=edit">[edit]</a></span>
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</td></tr>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"> <span class="t-lines"><span>iostate</span></span></a></div></div>
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</td>
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<td> state of the stream type
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<p>The following constants are also defined:
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</p>
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<table class="t-dsc-begin">
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+
<tr class="t-dsc-hitem">
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<td> Constant
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+
</td>
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<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&action=edit">[edit]</a></span>
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</td></tr>
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1213
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<tr class="t-dsc">
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<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>goodbit</tt></a>
1216
+
</td>
1217
+
<td> no error<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&action=edit">[edit]</a></span>
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</td></tr>
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+
1220
+
1221
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<tr class="t-dsc">
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<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>badbit</tt></a>
1223
+
</td>
1224
+
<td> irrecoverable stream error<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&action=edit">[edit]</a></span>
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</td></tr>
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<tr class="t-dsc">
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<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>failbit</tt></a>
1230
+
</td>
1231
+
<td> input/output operation failed (formatting or extraction error)<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&action=edit">[edit]</a></span>
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</td></tr>
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1234
+
1235
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<tr class="t-dsc">
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<td> <a href="ios_base/iostate.html" title="cpp/io/ios base/iostate"><tt>eofbit</tt></a>
1237
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</td>
1238
+
<td> associated input sequence has reached end-of-file<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&action=edit">[edit]</a></span>
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</td></tr>
1240
+
1241
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</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_iostate&action=edit">[edit]</a></span>
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</td></tr>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"> <span class="t-lines"><span>seekdir</span></span></a></div></div>
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</td>
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<td> seeking direction type
1248
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<p>The following constants are also defined:
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</p>
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<table class="t-dsc-begin">
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1252
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<tr class="t-dsc-hitem">
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<td> Constant
1254
+
</td>
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<td> Explanation<span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&action=edit">[edit]</a></span>
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</td></tr>
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<tr class="t-dsc">
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<td> <a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"><tt>beg</tt></a>
1261
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</td>
1262
+
<td> the beginning of a stream <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&action=edit">[edit]</a></span>
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</td></tr>
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+
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<tr class="t-dsc">
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<td> <a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"><tt>end</tt></a>
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</td>
1269
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<td> the ending of a stream <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&action=edit">[edit]</a></span>
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</td></tr>
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1272
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<tr class="t-dsc">
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<td> <a href="ios_base/seekdir.html" title="cpp/io/ios base/seekdir"><tt>cur</tt></a>
1275
+
</td>
1276
+
<td> the current position of stream position indicator <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&action=edit">[edit]</a></span>
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</td></tr>
1278
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1279
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</table> <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_seekdir&action=edit">[edit]</a></span>
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</td></tr>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="ios_base/event.html" title="cpp/io/ios base/event"> <span class="t-lines"><span>event</span></span></a></div></div>
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</td>
1285
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<td> specifies event type <br /> <span class="t-mark">(enum)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_event&action=edit">[edit]</a></span>
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</td></tr>
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<tr class="t-dsc">
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<td> <div class="t-dsc-member-div"><div><a href="ios_base/event_callback.html" title="cpp/io/ios base/event callback"> <span class="t-lines"><span>event_callback</span></span></a></div></div>
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</td>
1291
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<td> callback function type <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="https://en.cppreference.com/mwiki/index.php?title=Template:cpp/io/ios_base/dsc_event_callback&action=edit">[edit]</a></span>
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</td></tr>
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</table>
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</div>
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<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
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<table class="wikitable ftm-begin ftm-has-value">
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<tr>
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<th><a href="../utility/feature_test.html" title="cpp/utility/feature test">Feature-test</a> macro</th>
1300
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<th>Value</th>
1301
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<th><span title="Standard in which the feature is introduced">Std</span></th>
1302
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<th>Feature
1303
+
</th></tr>
1304
+
<tr>
1305
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<td><a href="../feature_test.html#cpp_lib_fstream_native_handle" title="cpp/feature test"><code>__cpp_lib_fstream_native_handle</code></a></td>
1306
+
<td><span class="mw-geshi cpp source-cpp"><span class="nu0">202306L</span></span></td>
1307
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<td><span class="t-mark">(C++26)</span></td>
1308
+
<td>native handles support
1309
+
</td></tr></table>
1310
+
<h3><span class="editsection">[<a href="https://en.cppreference.com/mwiki/index.php?title=cpp/io/basic_ifstream&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
1311
+
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <fstream></span>
1313
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<span class="co2">#include <iostream></span>
1314
+
<span class="co2">#include <string></span>
1315
+
 
1316
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
1317
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<span class="br0">{</span>
1318
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<a href="../string/basic_string.html"><span class="kw1233">std::<span class="me2">string</span></span></a> filename <span class="sy1">=</span> <span class="st0">"Test.b"</span><span class="sy4">;</span>
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+
 
1320
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<span class="co1">// prepare a file to read</span>
1321
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<span class="kw4">double</span> d <span class="sy1">=</span> <span class="nu16">3.14</span><span class="sy4">;</span>
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<a href="basic_ofstream.html"><span class="kw1735">std::<span class="me2">ofstream</span></span></a><span class="br0">(</span>filename, std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">binary</span><span class="br0">)</span>
1323
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.<span class="me1">write</span><span class="br0">(</span><span class="kw1">reinterpret_cast</span><span class="sy1"><</span><span class="kw4">char</span><span class="sy2">*</span><span class="sy1">></span><span class="br0">(</span><span class="sy3">&</span>d<span class="br0">)</span>, sizeof d<span class="br0">)</span> <span class="sy1"><<</span> <span class="nu0">123</span> <span class="sy1"><<</span> <span class="st0">"abc"</span><span class="sy4">;</span>
1324
+
 
1325
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<span class="co1">// open file for reading</span>
1326
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std<span class="sy4">::</span><span class="me2">ifstream</span> istrm<span class="br0">(</span>filename, std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">binary</span><span class="br0">)</span><span class="sy4">;</span>
1327
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<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>istrm.<span class="me1">is_open</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>
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<a href="cout.html"><span class="kw1759">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"failed to open "</span> <span class="sy1"><<</span> filename <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
1329
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<span class="kw1">else</span>
1330
+
<span class="br0">{</span>
1331
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<span class="kw4">double</span> d<span class="sy4">;</span>
1332
+
istrm.<span class="me1">read</span><span class="br0">(</span><span class="kw1">reinterpret_cast</span><span class="sy1"><</span><span class="kw4">char</span><span class="sy2">*</span><span class="sy1">></span><span class="br0">(</span><span class="sy3">&</span>d<span class="br0">)</span>, sizeof d<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// binary input</span>
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<span class="kw4">int</span> n<span class="sy4">;</span>
1334
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<a href="../string/basic_string.html"><span class="kw1233">std::<span class="me2">string</span></span></a> s<span class="sy4">;</span>
1335
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<span class="kw1">if</span> <span class="br0">(</span>istrm <span class="sy1">>></span> n <span class="sy1">>></span> s<span class="br0">)</span> <span class="co1">// text input</span>
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<a href="cout.html"><span class="kw1759">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"read back from file: "</span> <span class="sy1"><<</span> d <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> n <span class="sy1"><<</span> <span class="st0">' '</span> <span class="sy1"><<</span> s <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span>
1338
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<span class="br0">}</span></pre></div></div>
1339
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<p>Output:
1340
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</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">read back from file: 3.14 123 abc</pre></div></div>
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</div>
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<!--
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NewPP limit report
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1426
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build/a.out
build/a.out
This is a binary file and will not be displayed.
+214
src/indexer.cpp
+214
src/indexer.cpp
···
1
+
#include "indexer.hpp"
2
+
#include "prelude.hpp"
3
+
#include <cctype>
4
+
#include <cstdlib>
5
+
6
+
fn filter_divs(std::string_view html) noexcept -> String
7
+
{
8
+
var buffer = String();
9
+
while (not html.empty()) {
10
+
if (html.front() == '<') [[unlikely]] {
11
+
while (html.front() != '>')
12
+
html.remove_prefix(1);
13
+
html.remove_prefix(1);
14
+
} else {
15
+
buffer += html.front();
16
+
html.remove_prefix(1);
17
+
}
18
+
}
19
+
20
+
return buffer;
21
+
}
22
+
23
+
fn to_words(std::string_view lines) noexcept -> Vector<String>
24
+
{
25
+
var buffer = Vector<String>();
26
+
let valid_char = [](Char ch) {
27
+
return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
28
+
};
29
+
while (not lines.empty()) {
30
+
if (not valid_char(lines.front())) [[unlikely]] {
31
+
while (not lines.empty() &&
32
+
not valid_char(lines.front())) {
33
+
lines.remove_prefix(1);
34
+
}
35
+
} else {
36
+
var str = String();
37
+
while (valid_char(lines.front())) {
38
+
str += std::toupper(lines.front());
39
+
lines.remove_prefix(1);
40
+
}
41
+
buffer.push_back(str);
42
+
}
43
+
}
44
+
45
+
return buffer;
46
+
}
47
+
48
+
fn index_directory(std::filesystem::path dir) noexcept -> Vector<Document>
49
+
{
50
+
std::cout << "creating index of: " << dir << std::endl;
51
+
var documents = Vector<Document>();
52
+
for (let& dir_entry :
53
+
std::filesystem::recursive_directory_iterator(dir)) {
54
+
let path = dir_entry.path();
55
+
if (path.extension() != ".html")
56
+
continue;
57
+
let document = Document(path.native());
58
+
documents.push_back(document);
59
+
}
60
+
61
+
return documents;
62
+
}
63
+
64
+
fn count_query(Ref<const Vector<Document>> documents,
65
+
Ref<const String> query) noexcept
66
+
-> Vector<std::pair<String, F64>>
67
+
{
68
+
var matches = Vector<std::pair<String, F64>>();
69
+
for (let& document : documents) {
70
+
if (document.freqs.contains(query)) {
71
+
matches.push_back(
72
+
{document.filename, F64(document.freqs.at(query))});
73
+
}
74
+
}
75
+
return matches;
76
+
}
77
+
78
+
fn count_tfidf(Ref<const Vector<Document>> documents,
79
+
Ref<const String> query) noexcept
80
+
-> Vector<std::pair<String, F64>>
81
+
{
82
+
var matches = Vector<std::pair<String, F64>>();
83
+
var tf = F64();
84
+
var df = U64();
85
+
for (let& document : documents) {
86
+
if (document.freqs.contains(query)) {
87
+
tf = F64(document.freqs.at(query)) /
88
+
F64(document.freqs.size());
89
+
++df;
90
+
matches.push_back({document.filename, tf});
91
+
}
92
+
}
93
+
94
+
for (var & [ _, count ] : matches) {
95
+
count /= df;
96
+
}
97
+
return matches;
98
+
}
99
+
100
+
void cache_index(Ref<const Vector<Document>> documents) noexcept
101
+
{
102
+
std::cout << "caching index in: ";
103
+
using namespace std::filesystem;
104
+
/* check if cache dir exists and has an index */
105
+
let cache_dir = get_cache_dir();
106
+
create_directories(cache_dir);
107
+
let cache = cache_dir / "cache.txt"s;
108
+
109
+
std::cout << cache << std::endl;
110
+
111
+
/* index into cache dir */
112
+
var f = std::ofstream();
113
+
if (not exists(cache)) {
114
+
f.open(cache.c_str());
115
+
for (let& document : documents) {
116
+
f << document.filename << ' ' << document.freqs.size() << '\n';
117
+
for (let& [word, count] : document.freqs) {
118
+
f << word << ' ' << count << '\n';
119
+
}
120
+
}
121
+
f.close();
122
+
}
123
+
}
124
+
125
+
fn get_cache_dir() noexcept -> std::filesystem::path
126
+
{
127
+
using namespace std::filesystem;
128
+
var cache_dir = String();
129
+
if (std::getenv("XDG_CACHE_HOME")) {
130
+
cache_dir = path(std::getenv("XDG_CACHE_HOME")) / "stl-index";
131
+
} else if (std::getenv("HOME")) {
132
+
cache_dir = path(std::getenv("HOME")) / ".cache" / "stl-index";
133
+
} else {
134
+
cache_dir = path(".");
135
+
std::cerr << "Cache directory not found at `$XDG_CACHE_HOME` or `$HOME/.cache`." << std::endl;
136
+
std::cerr << "Cache will be dumped in the current directory. Do with it what you will." << std::endl;
137
+
}
138
+
139
+
return cache_dir;
140
+
}
141
+
142
+
fn load_index() noexcept -> Vector<Document>
143
+
{
144
+
std::cout << "loading index from: ";
145
+
var documents = Vector<Document>();
146
+
let cache_dir = get_cache_dir();
147
+
var cache = std::ifstream();
148
+
var path = cache_dir / "cache.txt";
149
+
std::cout << path << std::endl;
150
+
cache.open(path);
151
+
if (cache.is_open()) {
152
+
var n = 0ULL;
153
+
var count = 0ULL;
154
+
while (not cache.eof()) {
155
+
var freqs = Vector<std::pair<String, U64>>();
156
+
var filename = String();
157
+
var word = String();
158
+
cache >> filename;
159
+
cache >> n;
160
+
while (n-- && not cache.eof()) {
161
+
cache >> word;
162
+
cache >> count;
163
+
freqs.push_back({ word, count });
164
+
}
165
+
documents.emplace_back(filename, std::unordered_map(freqs.cbegin(), freqs.cend()));
166
+
}
167
+
}
168
+
169
+
return documents;
170
+
}
171
+
172
+
Document::Document(std::string_view name, map<String, U64>&& mp)
173
+
: freqs(mp), filename(name)
174
+
{
175
+
}
176
+
177
+
Document::Document(std::string_view name) : filename(name)
178
+
{
179
+
var f = std::ifstream(filename);
180
+
181
+
if (not f.is_open()) {
182
+
std::cout << "Failed to open: " << name << std::endl;
183
+
} else {
184
+
/* weird notation for converting a file to string */
185
+
var buffer = std::stringstream();
186
+
buffer << f.rdbuf();
187
+
let html = buffer.str();
188
+
189
+
let words = to_words(filter_divs(html));
190
+
for (let& str : words)
191
+
++freqs[str];
192
+
}
193
+
}
194
+
195
+
void Document::show_freqs() const noexcept
196
+
{
197
+
for (let & [ term, freq ] : freqs)
198
+
std::cout << term << ": " << freq << std::endl;
199
+
}
200
+
201
+
fn top_n_matches(Ref<const Vector<Document>> documents, Ref<const String> query, U64 n) noexcept
202
+
-> Vector<std::pair<String, F64>>
203
+
{
204
+
var matches = count_tfidf(documents, query);
205
+
let greater = [](let& x, let& y) { return x.second > y.second; };
206
+
if (matches.size() < n)
207
+
ra::sort(matches, greater);
208
+
else
209
+
ra::partial_sort(matches, matches.begin() + n, greater);
210
+
211
+
matches.resize(n);
212
+
213
+
return matches;
214
+
}
+45
src/indexer.hpp
+45
src/indexer.hpp
···
1
+
#pragma once
2
+
#include "prelude.hpp"
3
+
#include <filesystem>
4
+
#include <fstream>
5
+
#include <iostream>
6
+
#include <ranges>
7
+
#include <sstream>
8
+
#include <unordered_map>
9
+
10
+
template <typename Key, typename Value>
11
+
using map = std::unordered_map<Key, Value>;
12
+
13
+
struct Document {
14
+
map<String, U64> freqs;
15
+
String filename;
16
+
17
+
Document(std::string_view name, map<String, U64>&& mp);
18
+
19
+
Document(std::string_view name);
20
+
21
+
void show_freqs() const noexcept;
22
+
};
23
+
24
+
fn filter_divs(std::string_view html) noexcept -> String;
25
+
26
+
fn to_words(std::string_view lines) noexcept -> Vector<String>;
27
+
28
+
fn index_directory(std::filesystem::path dir) noexcept -> Vector<Document>;
29
+
30
+
void cache_index(Ref<const Vector<Document>> documents) noexcept;
31
+
32
+
fn load_index() noexcept -> Vector<Document>;
33
+
34
+
fn get_cache_dir() noexcept -> std::filesystem::path;
35
+
36
+
fn count_query(Ref<const Vector<Document>> documents,
37
+
Ref<const String> query) noexcept
38
+
-> Vector<std::pair<String, F64>>;
39
+
40
+
fn count_tfidf(Ref<const Vector<Document>> documents,
41
+
Ref<const String> query) noexcept
42
+
-> Vector<std::pair<String, F64>>;
43
+
44
+
fn top_n_matches(Ref<const Vector<Document>> documents, Ref<const String> query, U64 n) noexcept
45
+
-> Vector<std::pair<String, F64>>;
+52
src/main.cpp
+52
src/main.cpp
···
1
+
/* ========================================================================
2
+
*
3
+
* Filename: main.cpp
4
+
* Description: HTML Parser and Browser for cppreference
5
+
* Author: Diego A. Estrada Rivera
6
+
* Version: 0.0.1
7
+
*
8
+
* ======================================================================== */
9
+
#include "indexer.hpp"
10
+
#include "prelude.hpp"
11
+
#include <cctype>
12
+
13
+
namespace filesystem = std::filesystem;
14
+
15
+
proc Main([[maybe_unused]] std::span<const std::string_view> args) noexcept
16
+
-> I32
17
+
{
18
+
let cppref =
19
+
filesystem::path{"/home/Michorron/Git/cppreference-doc/"
20
+
"reference/en.cppreference.com"};
21
+
22
+
let cache = get_cache_dir() / "cache.txt";
23
+
var cache_created = exists(cache);
24
+
let documents = cache_created ? load_index() : index_directory(cppref) ;
25
+
if (not cache_created) cache_index(documents);
26
+
27
+
std::cout << "Succesfully indexed " << cppref.filename() << "!"
28
+
<< std::endl;
29
+
30
+
var query = String();
31
+
std::cout << "What is your query?\nType here: ";
32
+
std::getline(std::cin, query);
33
+
34
+
cache_index(documents);
35
+
36
+
let greater = [](let& x, let& y) { return x.second > y.second; };
37
+
38
+
for (var& c : query) c = std::toupper(c);
39
+
var matches = count_tfidf(documents, query);
40
+
if (matches.size() < 5)
41
+
ra::sort(matches, greater);
42
+
else
43
+
ra::partial_sort(matches, matches.begin() + 5, greater);
44
+
45
+
for (var idx = 0LLU; let & [ name, score ] : matches) {
46
+
if (idx > 5)
47
+
break;
48
+
std::cout << name << " had " << score << " score.\n";
49
+
++idx;
50
+
}
51
+
return 0;
52
+
}
+48
src/prelude.cpp
+48
src/prelude.cpp
···
1
+
/* ========================================================================
2
+
*
3
+
* Filename: prelude.hpp
4
+
* Description: C++ sensible prelude - Definitions
5
+
* Author: Diego A. Estrada Rivera
6
+
* Version: 0.0.4
7
+
*
8
+
* ======================================================================== */
9
+
#include "prelude.hpp"
10
+
#include <ranges>
11
+
12
+
/* type-safe main */
13
+
I32 main(const I32 argc, const Handle<const CString> argv)
14
+
{
15
+
proc Main(std::span<const std::string_view>) noexcept -> I32;
16
+
let args = std::vector<std::string_view>(
17
+
argv, std::next(argv, static_cast<std::ptrdiff_t>(argc)));
18
+
return Main(args);
19
+
}
20
+
21
+
/* Sensible IO */
22
+
#include <iostream>
23
+
24
+
proc getLine() noexcept -> String
25
+
{
26
+
var str = String();
27
+
getline(std::cin, str);
28
+
return str;
29
+
}
30
+
31
+
proc getChar() noexcept -> Char
32
+
{
33
+
var c = Char();
34
+
std::cin >> c;
35
+
return c;
36
+
}
37
+
38
+
proc print(const std::string_view& f) noexcept -> Unit
39
+
{
40
+
std::cout << f;
41
+
return Unit();
42
+
}
43
+
44
+
proc println(const std::string_view& f) noexcept -> Unit
45
+
{
46
+
std::cout << f << std::endl;
47
+
return Unit();
48
+
}
+141
src/prelude.hpp
+141
src/prelude.hpp
···
1
+
/* ========================================================================
2
+
*
3
+
* Filename: prelude.hpp
4
+
* Description: C++ sensible prelude - Declarations
5
+
* Author: Diego A. Estrada Rivera
6
+
* Version: 0.0.4
7
+
*
8
+
* ======================================================================== */
9
+
#pragma once
10
+
11
+
/* === Generic includes === */
12
+
#include <list>
13
+
14
+
#include <queue>
15
+
#include <span>
16
+
#include <stack>
17
+
#include <unordered_map>
18
+
#include <unordered_set>
19
+
20
+
#include <algorithm>
21
+
#include <numeric>
22
+
#include <ranges>
23
+
24
+
#include <format>
25
+
#include <fstream>
26
+
27
+
/* === Numeric Types === */
28
+
#include <cstdint>
29
+
#include <limits.h>
30
+
using Size = std::size_t;
31
+
32
+
/* Floating Point */
33
+
// brain floating point
34
+
// see https://en.wikipedia.org/wiki/Bfloat16_floating-point_format
35
+
typedef __bf16 BF16;
36
+
typedef _Float16 F16;
37
+
typedef float F32;
38
+
static_assert(sizeof(F32) * CHAR_BIT == 32); //
39
+
typedef double F64;
40
+
static_assert(sizeof(F64) * CHAR_BIT == 64);
41
+
#if __float80_max < __float128_max
42
+
typedef __float80 F80; // sometimes is the same as F128
43
+
#endif
44
+
typedef __float128 F128;
45
+
46
+
// decimal floating points
47
+
// see decimal32/64/128 in https://en.wikipedia.org/wiki/IEEE_754
48
+
#if 0
49
+
typedef float __attribute__((mode(SD))) D32;
50
+
typedef float __attribute__((mode(DD))) D64;
51
+
typedef float __attribute__((mode(TD))) D128;
52
+
#endif
53
+
54
+
/* Integer */
55
+
typedef uint8_t U8;
56
+
typedef uint16_t U16;
57
+
typedef uint32_t U32;
58
+
typedef uint64_t U64;
59
+
typedef __uint128_t U128;
60
+
61
+
typedef int8_t I8;
62
+
typedef int16_t I16;
63
+
typedef int32_t I32;
64
+
typedef int64_t I64;
65
+
typedef __int128_t I128;
66
+
67
+
// generic Integer type
68
+
typedef int_fast32_t Int;
69
+
70
+
/* === Other Types === */
71
+
typedef bool Bool;
72
+
typedef char Char;
73
+
typedef const char* CString;
74
+
75
+
#include <vector>
76
+
template <typename T> using Vector = std::vector<T>;
77
+
78
+
#include <string>
79
+
using String = std::string;
80
+
using namespace std::string_literals;
81
+
82
+
namespace ra = std::ranges;
83
+
namespace vi = std::ranges::views;
84
+
85
+
// Unit type
86
+
enum class Unit { unit };
87
+
88
+
// Void type
89
+
enum class Void {};
90
+
91
+
// Pointer types
92
+
template <typename T> using Ref = T&;
93
+
94
+
template <typename T> using Handle = T*;
95
+
96
+
/* === Keywords === */
97
+
#define let auto const
98
+
#define var auto
99
+
#define fn [[nodiscard, gnu::const]] auto
100
+
#define proc [[nodiscard]] auto
101
+
102
+
/* This is included as a static member variable of <tuple>.
103
+
* However, there is no way to bring the std::ignore namespace static variable
104
+
* into the current scope. This is a way to do that.
105
+
* https://en.cppreference.com/w/cpp/utility/tuple/ignore
106
+
*/
107
+
namespace detail {
108
+
struct ignore_t {
109
+
template <typename T>
110
+
constexpr // required since C++14
111
+
void
112
+
operator=(T&&) const noexcept
113
+
{
114
+
}
115
+
};
116
+
} // namespace detail
117
+
inline constinit const detail::ignore_t ignore; // changed to constinit
118
+
119
+
// manage tuples better
120
+
#define fst std::get<0>
121
+
#define snd std::get<1>
122
+
#define thr std::get<2>
123
+
124
+
/* === Miscellaneous Functions */
125
+
template <class D, class C> fn memoize(let& op) noexcept
126
+
{
127
+
static var mp = std::unordered_map<D, C>();
128
+
return [=](D const& x) noexcept {
129
+
return mp.contains(x) ? mp.at(x) : mp[x] = op(x);
130
+
};
131
+
}
132
+
133
+
/* Sensible IO */
134
+
#include <iostream>
135
+
proc getLine() noexcept -> String;
136
+
137
+
proc getChar() noexcept -> Char;
138
+
139
+
proc print(const std::string_view& f) noexcept -> Unit;
140
+
141
+
proc println(const std::string_view& f) noexcept -> Unit;