is_nothrow_assignable.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_TYPE_TRAITS_IS_NOTHROW_ASSIGNABLE_HPP
#define TETL_TYPE_TRAITS_IS_NOTHROW_ASSIGNABLE_HPP
 
#include <etl/_type_traits/bool_constant.hpp>
#include <etl/_type_traits/declval.hpp>
#include <etl/_type_traits/is_assignable.hpp>
 
namespace etl {
 
/// \brief If the expression etl::declval<T>() = etl::declval<U>() is
/// well-formed in unevaluated context, provides the member constant value equal
/// true. Otherwise, value is false. Access checks are performed as if from a
/// context unrelated to either type.
template <typename T, typename U>
struct is_nothrow_assignable : false_type { };
 
template <typename T, typename U>
    requires is_assignable_v<T, U>
struct is_nothrow_assignable<T, U> : bool_constant<noexcept(etl::declval<T>() = etl::declval<U>())> { };
 
template <typename T, typename U>
inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<T, U>::value;
 
} // namespace etl
 
#endif // TETL_TYPE_TRAITS_IS_NOTHROW_ASSIGNABLE_HPP