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Telegram/ThirdParty/range-v3/test/utility/compare.cpp

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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
+//
+#if __cplusplus > 201703L && __has_include(<compare>) && \
+    defined(__cpp_concepts) && defined(__cpp_impl_three_way_comparison)
+
+#include <compare>
+#include <range/v3/compare.hpp>
+#include <range/v3/range_fwd.hpp>
+
+using ranges::same_as;
+using ranges::common_comparison_category_t;
+
+static_assert(same_as<common_comparison_category_t<std::partial_ordering>, std::partial_ordering>);
+static_assert(same_as<common_comparison_category_t<std::weak_ordering>, std::weak_ordering>);
+static_assert(same_as<common_comparison_category_t<std::strong_ordering>, std::strong_ordering>);
+
+static_assert(same_as<common_comparison_category_t<std::partial_ordering, std::strong_ordering>, std::partial_ordering>);
+static_assert(same_as<common_comparison_category_t<std::weak_ordering, std::strong_ordering>, std::weak_ordering>);
+static_assert(same_as<common_comparison_category_t<std::strong_ordering, std::strong_ordering>, std::strong_ordering>);
+static_assert(same_as<common_comparison_category_t<std::weak_ordering, std::strong_ordering, std::partial_ordering>, std::partial_ordering>);
+
+static_assert(same_as<common_comparison_category_t<ranges::less, std::partial_ordering>, void>);
+static_assert(same_as<common_comparison_category_t<ranges::less*, std::strong_ordering>, void>);
+static_assert(same_as<common_comparison_category_t<ranges::less&, std::strong_ordering, std::partial_ordering>, void>);
+static_assert(same_as<common_comparison_category_t<ranges::less(*)(), std::strong_ordering, std::partial_ordering>, void>);
+#endif // __cplusplus
+
+int main() {}