C++20Compatibility.hpp

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//          Copyright Dominic (DNKpp) Koepke 2024 - 2025.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          https://www.boost.org/LICENSE_1_0.txt)
 
#ifndef MIMICPP_UTILITIES_CXX20_COMPATIBILITY_HPP
#define MIMICPP_UTILITIES_CXX20_COMPATIBILITY_HPP
 
#pragma once
 
#include "mimic++/config/Config.hpp"
 
#ifndef MIMICPP_DETAIL_IS_MODULE
    #include <version>
#endif
 
#ifdef __cpp_lib_bit_cast
 
    #ifndef MIMICPP_DETAIL_IS_MODULE
        #include <bit>
    #endif
 
MIMICPP_DETAIL_MODULE_EXPORT namespace mimicpp::util
{
    using std::bit_cast;
}
 
#else
 
    #ifndef MIMICPP_DETAIL_IS_MODULE
        #include <cstring>
        #include <type_traits>
    #endif
 
MIMICPP_DETAIL_MODULE_EXPORT namespace mimicpp::util
{
    // taken from: https://www.en.cppreference.com/w/cpp/numeric/bit_cast.html
    template <typename To, typename From>
    std::enable_if_t<
        sizeof(To) == sizeof(From)
            && std::is_trivially_copyable_v<From>
            && std::is_trivially_copyable_v<To>,
        To>
    // constexpr support needs compiler magic
    bit_cast(From const& src) noexcept
    {
        static_assert(std::is_trivially_constructible_v<To>, "This implementation additionally requires destination type to be trivially constructible");
 
        To dst;
        std::memcpy(&dst, &src, sizeof(To));
 
        return dst;
    }
}
 
#endif
 
#endif