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Telegram/ThirdParty/range-v3/include/range/v3/compare.hpp

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