43 lines
953 B
C++
43 lines
953 B
C++
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// This file is part of the mcl project.
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// Copyright (c) 2022 merryhime
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "mcl/mp/metavalue/logic_if.hpp"
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#include "mcl/mp/metavalue/value.hpp"
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namespace mcl::mp {
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namespace detail {
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template<class...>
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struct conjunction_impl;
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template<>
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struct conjunction_impl<> {
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using type = false_type;
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};
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template<class V>
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struct conjunction_impl<V> {
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using type = V;
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};
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template<class V1, class... Vs>
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struct conjunction_impl<V1, Vs...> {
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using type = logic_if<V1, typename conjunction_impl<Vs...>::type, V1>;
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};
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} // namespace detail
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/// Conjunction of metavalues Vs with short-circuiting and type preservation.
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template<class... Vs>
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using conjunction = typename detail::conjunction_impl<Vs...>::type;
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/// Conjunction of metavalues Vs with short-circuiting and type preservation.
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template<class... Vs>
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constexpr auto conjunction_v = conjunction<Vs...>::value;
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} // namespace mcl::mp
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