assignable_from.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_CONCEPTS_ASSIGNABLE_FROM_HPP
#define TETL_CONCEPTS_ASSIGNABLE_FROM_HPP
 
#include <etl/_concepts/common_reference_with.hpp>
#include <etl/_concepts/same_as.hpp>
#include <etl/_type_traits/is_lvalue_reference.hpp>
#include <etl/_type_traits/remove_reference.hpp>
#include <etl/_utility/forward.hpp>
 
namespace etl {
 
// clang-format off
 
/// \headerfile etl/concepts.hpp
/// \ingroup concepts
template<typename LHS, typename RHS>
concept assignable_from =
        is_lvalue_reference_v<LHS>
    // and common_reference_with<remove_reference_t<LHS> const&, remove_reference_t<RHS> const&>
    and requires(LHS lhs, RHS&& rhs) {
        { lhs = etl::forward<RHS>(rhs) } -> same_as<LHS>;
    };
 
// clang-format on
 
} // namespace etl
 
#endif // TETL_CONCEPTS_ASSIGNABLE_FROM_HPP