Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

boost/describe/detail/config.hpp

#ifndef BOOST_DESCRIBE_DETAIL_CONFIG_HPP_INCLUDED
#define BOOST_DESCRIBE_DETAIL_CONFIG_HPP_INCLUDED

// Copyright 2021 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt

#if __cplusplus >= 201402L

# define BOOST_DESCRIBE_CXX14
# define BOOST_DESCRIBE_CXX11

#elif defined(_MSC_VER) && _MSC_VER >= 1900

# define BOOST_DESCRIBE_CXX14
# define BOOST_DESCRIBE_CXX11

#elif __cplusplus >= 201103L

# define BOOST_DESCRIBE_CXX11

# if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 7
#  undef BOOST_DESCRIBE_CXX11
# endif

#endif

#if defined(BOOST_DESCRIBE_CXX11)
# define BOOST_DESCRIBE_CONSTEXPR_OR_CONST constexpr
#else
# define BOOST_DESCRIBE_CONSTEXPR_OR_CONST const
#endif

#if defined(__clang__)
# define BOOST_DESCRIBE_MAYBE_UNUSED __attribute__((unused))
#else
# define BOOST_DESCRIBE_MAYBE_UNUSED
#endif

#endif // #ifndef BOOST_DESCRIBE_DETAIL_CONFIG_HPP_INCLUDED