| 1 | /*! |
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| 2 | @file |
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| 3 | Defines macros for commonly used type traits. |
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| 4 | |
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| 5 | Copyright Louis Dionne 2013-2022 |
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| 6 | Distributed under the Boost Software License, Version 1.0. |
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| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef BOOST_HANA_DETAIL_INTRINSICS_HPP |
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| 11 | #define BOOST_HANA_DETAIL_INTRINSICS_HPP |
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| 12 | |
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| 13 | #include <boost/hana/config.hpp> |
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| 14 | |
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| 15 | |
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| 16 | // We use intrinsics if they are available because it speeds up the |
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| 17 | // compile-times. |
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| 18 | #if defined(BOOST_HANA_CONFIG_CLANG) |
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| 19 | # if __has_extension(is_empty) |
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| 20 | # define BOOST_HANA_TT_IS_EMPTY(T) __is_empty(T) |
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| 21 | # endif |
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| 22 | |
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| 23 | # if __has_extension(is_final) |
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| 24 | # define BOOST_HANA_TT_IS_FINAL(T) __is_final(T) |
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| 25 | # endif |
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| 26 | |
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| 27 | // TODO: Right now, this intrinsic is never used directly because of |
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| 28 | // https://llvm.org/bugs/show_bug.cgi?id=24173 |
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| 29 | # if __has_extension(is_constructible) && false |
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| 30 | # define BOOST_HANA_TT_IS_CONSTRUCTIBLE(...) __is_constructible(__VA_ARGS__) |
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| 31 | # endif |
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| 32 | |
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| 33 | # if __has_extension(is_assignable) |
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| 34 | # define BOOST_HANA_TT_IS_ASSIGNABLE(T, U) __is_assignable(T, U) |
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| 35 | # endif |
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| 36 | |
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| 37 | # if __has_extension(is_convertible) |
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| 38 | # define BOOST_HANA_TT_IS_CONVERTIBLE(T, U) __is_convertible(T, U) |
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| 39 | # endif |
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| 40 | #endif |
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| 41 | |
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| 42 | #if !defined(BOOST_HANA_TT_IS_EMPTY) |
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| 43 | # include <type_traits> |
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| 44 | # define BOOST_HANA_TT_IS_EMPTY(T) ::std::is_empty<T>::value |
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| 45 | #endif |
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| 46 | |
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| 47 | #if !defined(BOOST_HANA_TT_IS_FINAL) |
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| 48 | # include <type_traits> |
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| 49 | # define BOOST_HANA_TT_IS_FINAL(T) ::std::is_final<T>::value |
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| 50 | #endif |
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| 51 | |
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| 52 | #if !defined(BOOST_HANA_TT_IS_CONSTRUCTIBLE) |
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| 53 | # include <type_traits> |
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| 54 | # define BOOST_HANA_TT_IS_CONSTRUCTIBLE(...) ::std::is_constructible<__VA_ARGS__>::value |
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| 55 | #endif |
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| 56 | |
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| 57 | #if !defined(BOOST_HANA_TT_IS_ASSIGNABLE) |
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| 58 | # include <type_traits> |
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| 59 | # define BOOST_HANA_TT_IS_ASSIGNABLE(T, U) ::std::is_assignable<T, U>::value |
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| 60 | #endif |
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| 61 | |
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| 62 | #if !defined(BOOST_HANA_TT_IS_CONVERTIBLE) |
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| 63 | # include <type_traits> |
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| 64 | # define BOOST_HANA_TT_IS_CONVERTIBLE(T, U) ::std::is_convertible<T, U>::value |
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| 65 | #endif |
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| 66 | |
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| 67 | #endif // !BOOST_HANA_DETAIL_INTRINSICS_HPP |
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| 68 | |
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