#include <iostream>

static void operator ""_break (const char* str, [[maybe_unused]] std::size_t) {
    std::cout << std::endl << "Reached breakpoint: " << str << std::endl;
    std::cout << "[Press Enter to continue]";
    std::cin.ignore();
}

auto main() noexcept -> int
{
        std::cout << "1 + 1 = " << ("before sum"_break, 1 + 1)
            << std::endl;
        "after sum"_break;
	return 0;
}