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- /*!
- @file
- Defines macros for commonly used type traits.
- @copyright Louis Dionne 2013-2017
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- */
- #ifndef BOOST_HANA_DETAIL_INTRINSICS_HPP
- #define BOOST_HANA_DETAIL_INTRINSICS_HPP
- #include <boost/hana/config.hpp>
- // We use intrinsics if they are available because it speeds up the
- // compile-times.
- #if defined(BOOST_HANA_CONFIG_CLANG)
- # if __has_extension(is_empty)
- # define BOOST_HANA_TT_IS_EMPTY(T) __is_empty(T)
- # endif
- # if __has_extension(is_final)
- # define BOOST_HANA_TT_IS_FINAL(T) __is_final(T)
- # endif
- // TODO: Right now, this intrinsic is never used directly because of
- // https://llvm.org/bugs/show_bug.cgi?id=24173
- # if __has_extension(is_constructible) && false
- # define BOOST_HANA_TT_IS_CONSTRUCTIBLE(...) __is_constructible(__VA_ARGS__)
- # endif
- # if __has_extension(is_assignable)
- # define BOOST_HANA_TT_IS_ASSIGNABLE(T, U) __is_assignable(T, U)
- # endif
- # if __has_extension(is_convertible)
- # define BOOST_HANA_TT_IS_CONVERTIBLE(T, U) __is_convertible(T, U)
- # endif
- #endif
- #if !defined(BOOST_HANA_TT_IS_EMPTY)
- # include <type_traits>
- # define BOOST_HANA_TT_IS_EMPTY(T) ::std::is_empty<T>::value
- #endif
- #if !defined(BOOST_HANA_TT_IS_FINAL)
- # include <type_traits>
- # define BOOST_HANA_TT_IS_FINAL(T) ::std::is_final<T>::value
- #endif
- #if !defined(BOOST_HANA_TT_IS_CONSTRUCTIBLE)
- # include <type_traits>
- # define BOOST_HANA_TT_IS_CONSTRUCTIBLE(...) ::std::is_constructible<__VA_ARGS__>::value
- #endif
- #if !defined(BOOST_HANA_TT_IS_ASSIGNABLE)
- # include <type_traits>
- # define BOOST_HANA_TT_IS_ASSIGNABLE(T, U) ::std::is_assignable<T, U>::value
- #endif
- #if !defined(BOOST_HANA_TT_IS_CONVERTIBLE)
- # include <type_traits>
- # define BOOST_HANA_TT_IS_CONVERTIBLE(T, U) ::std::is_convertible<T, U>::value
- #endif
- #endif // !BOOST_HANA_DETAIL_INTRINSICS_HPP
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