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47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/// \file
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// CPP, the Concepts PreProcessor library
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//
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// Copyright Eric Niebler 2018-present
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// Copyright (c) 2020-present, Google LLC.
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// This source code is licensed under the MIT license found in the
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// LICENSE file in the root directory of this source tree.
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_COMPARE_HPP
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#define RANGES_V3_COMPARE_HPP
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#if __cplusplus > 201703L && __has_include(<compare>) && \
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defined(__cpp_concepts) && defined(__cpp_impl_three_way_comparison)
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#include <compare>
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#include <type_traits>
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namespace ranges
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{
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template<typename... Ts>
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struct common_comparison_category
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{
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using type = void;
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};
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template<typename... Ts>
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requires ((std::is_same_v<Ts, std::partial_ordering> ||
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std::is_same_v<Ts, std::weak_ordering> ||
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std::is_same_v<Ts, std::strong_ordering>) && ...)
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struct common_comparison_category<Ts...> : std::common_type<Ts...>
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{};
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template<typename... Ts>
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using common_comparison_category_t = typename common_comparison_category<Ts...>::type;
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} // namespace ranges
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#endif // __cplusplus
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#endif // RANGES_V3_COMPARE_HPP
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