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1// - casts.hpp -- BLambda Library -------------
2//
3// Copyright (C) 2000 Gary Powell (powellg@amazon.com)
4// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
5//
6// Distributed under the Boost Software License, Version 1.0. (See
7// accompanying file LICENSE_1_0.txt or copy at
8// http://www.boost.org/LICENSE_1_0.txt)
9//
10// For more information, see http://www.boost.org
11
12// -----------------------------------------------
13
14#if !defined(BOOST_LAMBDA_CASTS_HPP)
15#define BOOST_LAMBDA_CASTS_HPP
16
17#include "boost/lambda/detail/suppress_unused.hpp"
18#include "boost/lambda/core.hpp"
19
20#include <typeinfo>
21
22namespace boost {
23namespace lambda {
24
25template<class Act, class Args>
26struct return_type_N;
27
28template<class T> class cast_action;
29
30template<class T> class static_cast_action;
31template<class T> class dynamic_cast_action;
32template<class T> class const_cast_action;
33template<class T> class reinterpret_cast_action;
34
35class typeid_action;
36class sizeof_action;
37
38// Cast actions
39
40template<class T> class cast_action<static_cast_action<T> >
41{
42public:
43 template<class RET, class Arg1>
44 static RET apply(Arg1 &a1) {
45 return static_cast<RET>(a1);
46 }
47};
48
49template<class T> class cast_action<dynamic_cast_action<T> > {
50public:
51 template<class RET, class Arg1>
52 static RET apply(Arg1 &a1) {
53 return dynamic_cast<RET>(a1);
54 }
55};
56
57template<class T> class cast_action<const_cast_action<T> > {
58public:
59 template<class RET, class Arg1>
60 static RET apply(Arg1 &a1) {
61 return const_cast<RET>(a1);
62 }
63};
64
65template<class T> class cast_action<reinterpret_cast_action<T> > {
66public:
67 template<class RET, class Arg1>
68 static RET apply(Arg1 &a1) {
69 return reinterpret_cast<RET>(a1);
70 }
71};
72
73// typeid action
74class typeid_action {
75public:
76 template<class RET, class Arg1>
77 static RET apply(Arg1 &a1) {
78 detail::suppress_unused_variable_warnings(a1);
79 return typeid(a1);
80 }
81};
82
83// sizeof action
84class sizeof_action
85{
86public:
87 template<class RET, class Arg1>
88 static RET apply(Arg1 &a1) {
89 return sizeof(a1);
90 }
91};
92
93
94// return types of casting lambda_functors (all "T" type.)
95
96template<template <class> class cast_type, class T, class A>
97struct return_type_N<cast_action< cast_type<T> >, A> {
98 typedef T type;
99};
100
101// return type of typeid_action
102template<class A>
103struct return_type_N<typeid_action, A> {
104 typedef std::type_info const & type;
105};
106
107// return type of sizeof_action
108
109template<class A>
110struct return_type_N<sizeof_action, A> {
111 typedef std::size_t type;
112};
113
114
115// the four cast & typeid overloads.
116// casts can take ordinary variables (not just lambda functors)
117
118// static_cast
119template <class T, class Arg1>
120inline const lambda_functor<
121 lambda_functor_base<
122 action<1, cast_action<static_cast_action<T> > >,
123 tuple<typename const_copy_argument <const Arg1>::type>
124 >
125>
126ll_static_cast(const Arg1& a1) {
127 return
128 lambda_functor_base<
129 action<1, cast_action<static_cast_action<T> > >,
130 tuple<typename const_copy_argument <const Arg1>::type>
131 >
132 ( tuple<typename const_copy_argument <const Arg1>::type>(a1));
133}
134
135// dynamic_cast
136template <class T, class Arg1>
137inline const lambda_functor<
138 lambda_functor_base<
139 action<1, cast_action<dynamic_cast_action<T> > >,
140 tuple<typename const_copy_argument <const Arg1>::type>
141 >
142>
143ll_dynamic_cast(const Arg1& a1) {
144 return
145 lambda_functor_base<
146 action<1, cast_action<dynamic_cast_action<T> > >,
147 tuple<typename const_copy_argument <const Arg1>::type>
148 >
149 ( tuple<typename const_copy_argument <const Arg1>::type>(a1));
150}
151
152// const_cast
153template <class T, class Arg1>
154inline const lambda_functor<
155 lambda_functor_base<
156 action<1, cast_action<const_cast_action<T> > >,
157 tuple<typename const_copy_argument <const Arg1>::type>
158 >
159>
160ll_const_cast(const Arg1& a1) {
161 return
162 lambda_functor_base<
163 action<1, cast_action<const_cast_action<T> > >,
164 tuple<typename const_copy_argument <const Arg1>::type>
165 >
166 ( tuple<typename const_copy_argument <const Arg1>::type>(a1));
167}
168
169// reinterpret_cast
170template <class T, class Arg1>
171inline const lambda_functor<
172 lambda_functor_base<
173 action<1, cast_action<reinterpret_cast_action<T> > >,
174 tuple<typename const_copy_argument <const Arg1>::type>
175 >
176>
177ll_reinterpret_cast(const Arg1& a1) {
178 return
179 lambda_functor_base<
180 action<1, cast_action<reinterpret_cast_action<T> > >,
181 tuple<typename const_copy_argument <const Arg1>::type>
182 >
183 ( tuple<typename const_copy_argument <const Arg1>::type>(a1));
184}
185
186// typeid
187// can be applied to a normal variable as well (can refer to a polymorphic
188// class object)
189template <class Arg1>
190inline const lambda_functor<
191 lambda_functor_base<
192 action<1, typeid_action>,
193 tuple<typename const_copy_argument <const Arg1>::type>
194 >
195>
196ll_typeid(const Arg1& a1) {
197 return
198 lambda_functor_base<
199 action<1, typeid_action>,
200 tuple<typename const_copy_argument <const Arg1>::type>
201 >
202 ( tuple<typename const_copy_argument <const Arg1>::type>(a1));
203}
204
205// sizeof(expression)
206// Always takes a lambda expression (if not, built in sizeof will do)
207template <class Arg1>
208inline const lambda_functor<
209 lambda_functor_base<
210 action<1, sizeof_action>,
211 tuple<lambda_functor<Arg1> >
212 >
213>
214ll_sizeof(const lambda_functor<Arg1>& a1) {
215 return
216 lambda_functor_base<
217 action<1, sizeof_action>,
218 tuple<lambda_functor<Arg1> >
219 >
220 ( tuple<lambda_functor<Arg1> >(a1));
221}
222
223} // namespace lambda
224} // namespace boost
225
226#endif