boost/pfr/detail/config.hpp
// Copyright (c) 2016-2022 Antony Polukhin // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_PFR_DETAIL_CONFIG_HPP #define BOOST_PFR_DETAIL_CONFIG_HPP #pragma once #include <type_traits> // to get non standard platform macro definitions (__GLIBCXX__ for example) // Reminder: // * MSVC++ 14.2 _MSC_VER == 1927 <- Loophole is known to work (Visual Studio ????) // * MSVC++ 14.1 _MSC_VER == 1916 <- Loophole is known to NOT work (Visual Studio 2017) // * MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015) // * MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013) #if defined(_MSC_VER) # if !defined(_MSVC_LANG) || _MSC_VER <= 1900 # error Boost.PFR library requires more modern MSVC compiler. # endif #elif __cplusplus < 201402L # error Boost.PFR library requires at least C++14. #endif #ifndef BOOST_PFR_USE_LOOPHOLE # if defined(_MSC_VER) # if _MSC_VER >= 1927 # define BOOST_PFR_USE_LOOPHOLE 1 # else # define BOOST_PFR_USE_LOOPHOLE 0 # endif # elif defined(__clang_major__) && __clang_major__ >= 8 # define BOOST_PFR_USE_LOOPHOLE 0 # else # define BOOST_PFR_USE_LOOPHOLE 1 # endif #endif #ifndef BOOST_PFR_USE_CPP17 # ifdef __cpp_structured_bindings # define BOOST_PFR_USE_CPP17 1 # elif defined(_MSVC_LANG) # if _MSVC_LANG >= 201703L # define BOOST_PFR_USE_CPP17 1 # else # define BOOST_PFR_USE_CPP17 0 # endif # else # define BOOST_PFR_USE_CPP17 0 # endif #endif #if (!BOOST_PFR_USE_CPP17 && !BOOST_PFR_USE_LOOPHOLE) # if (defined(_MSC_VER) && _MSC_VER < 1916) ///< in Visual Studio 2017 v15.9 PFR library with classic engine normally works # error Boost.PFR requires /std:c++latest or /std:c++17 flags on your compiler. # endif #endif #ifndef BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE // Assume that libstdc++ since GCC-7.3 does not have linear instantiation depth in std::make_integral_sequence # if defined( __GLIBCXX__) && __GLIBCXX__ >= 20180101 # define BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE 1 # elif defined(_MSC_VER) # define BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE 1 //# elif other known working lib # else # define BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE 0 # endif #endif #ifndef BOOST_PFR_HAS_GUARANTEED_COPY_ELISION # if defined(__cpp_guaranteed_copy_elision) && (!defined(_MSC_VER) || _MSC_VER > 1928) # define BOOST_PFR_HAS_GUARANTEED_COPY_ELISION 1 # else # define BOOST_PFR_HAS_GUARANTEED_COPY_ELISION 0 # endif #endif #if defined(__has_cpp_attribute) # if __has_cpp_attribute(maybe_unused) # define BOOST_PFR_MAYBE_UNUSED [[maybe_unused]] # endif #endif #ifndef BOOST_PFR_MAYBE_UNUSED # define BOOST_PFR_MAYBE_UNUSED #endif #endif // BOOST_PFR_DETAIL_CONFIG_HPP