// Copyright (c) 2016-2020 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PFR_DETAIL_CONFIG_HPP
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#define BOOST_PFR_DETAIL_CONFIG_HPP
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#pragma once
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#include <type_traits> // to get non standard platform macro definitions (__GLIBCXX__ for example)
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// Reminder:
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// * MSVC++ 14.2 _MSC_VER == 1927 <- Loophole is known to work (Visual Studio ????)
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// * MSVC++ 14.1 _MSC_VER == 1916 <- Loophole is known to NOT work (Visual Studio 2017)
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// * MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015)
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// * MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013)
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#if defined(_MSC_VER)
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# if !defined(_MSVC_LANG) || _MSC_VER <= 1900
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# error Boost.PFR library requires more modern MSVC compiler.
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# endif
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#elif __cplusplus < 201402L
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# error Boost.PFR library requires at least C++14.
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#endif
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#ifndef BOOST_PFR_USE_LOOPHOLE
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# if defined(_MSC_VER)
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# if _MSC_VER >= 1927
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# define BOOST_PFR_USE_LOOPHOLE 1
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# else
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# define BOOST_PFR_USE_LOOPHOLE 0
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# endif
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# elif defined(__clang_major__) && __clang_major__ >= 8
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# define BOOST_PFR_USE_LOOPHOLE 0
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# else
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# define BOOST_PFR_USE_LOOPHOLE 1
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# endif
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#endif
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#ifndef BOOST_PFR_USE_CPP17
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# ifdef __cpp_structured_bindings
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# define BOOST_PFR_USE_CPP17 1
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# elif defined(_MSVC_LANG)
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# if _MSVC_LANG >= 201703L
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# define BOOST_PFR_USE_CPP17 1
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# else
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# define BOOST_PFR_USE_CPP17 0
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# if !BOOST_PFR_USE_LOOPHOLE
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# error Boost.PFR requires /std:c++latest or /std:c++17 flags on your compiler.
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# endif
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# endif
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# else
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# define BOOST_PFR_USE_CPP17 0
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# endif
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#endif
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#ifndef BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE
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// Assume that libstdc++ since GCC-7.3 does not have linear instantiation depth in std::make_integral_sequence
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# if defined( __GLIBCXX__) && __GLIBCXX__ >= 20180101
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# define BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE 1
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# elif defined(_MSC_VER)
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# define BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE 1
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//# elif other known working lib
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# else
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# define BOOST_PFR_USE_STD_MAKE_INTEGRAL_SEQUENCE 0
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# endif
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#endif
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#if defined(__has_cpp_attribute)
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# if __has_cpp_attribute(maybe_unused)
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# define BOOST_PFR_MAYBE_UNUSED [[maybe_unused]]
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# endif
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#endif
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#ifndef BOOST_PFR_MAYBE_UNUSED
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# define BOOST_PFR_MAYBE_UNUSED
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#endif
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#endif // BOOST_PFR_DETAIL_CONFIG_HPP
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