1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONVERTIBLE_H 10#define _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONVERTIBLE_H 11 12#include <__config> 13#include <__type_traits/conjunction.h> 14#include <__type_traits/disjunction.h> 15#include <__type_traits/integral_constant.h> 16#include <__type_traits/is_convertible.h> 17#include <__type_traits/is_void.h> 18#include <__type_traits/lazy.h> 19#include <__utility/declval.h> 20 21#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22# pragma GCC system_header 23#endif 24 25_LIBCPP_BEGIN_NAMESPACE_STD 26 27#if _LIBCPP_STD_VER >= 20 28 29template <typename _Tp> 30void __test_noexcept(_Tp) noexcept; 31 32template <typename _Fm, typename _To> 33bool_constant<noexcept(std::__test_noexcept<_To>(std::declval<_Fm>()))> __is_nothrow_convertible_test(); 34 35template <typename _Fm, typename _To> 36struct __is_nothrow_convertible_helper : decltype(__is_nothrow_convertible_test<_Fm, _To>()) {}; 37 38template <typename _Fm, typename _To> 39struct is_nothrow_convertible 40 : _Or<_And<is_void<_To>, is_void<_Fm>>, 41 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To> > >::type {}; 42 43template <typename _Fm, typename _To> 44inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 45 46#endif // _LIBCPP_STD_VER >= 20 47 48_LIBCPP_END_NAMESPACE_STD 49 50#endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_CONVERTIBLE_H 51