Differential D101547 Diff 342743 libcxx/test/std/ranges/range.view/view.subsumption.compile.pass.cpp

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Standalone View

				//===----------------------------------------------------------------------===//
				//
				// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
				// See https://llvm.org/LICENSE.txt for license information.
				// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
				//
				//===----------------------------------------------------------------------===//

				// UNSUPPORTED: c++03, c++11, c++14, c++17
				// UNSUPPORTED: libcpp-no-concepts

				// <ranges>

				// template<class T>
				// concept view = ...;

				#include <ranges>

				#include "test_macros.h"

				struct View : std::ranges::view_base {
				View() = default;
				View(View&&) = default;
				View& operator=(View&&) = default;
				friend int* begin(View&);
				friend int* begin(View const&);
				friend int* end(View&);
				friend int* end(View const&);
				};

				namespace subsume_range {
				template <std::ranges::view>
				constexpr bool test() { return true; }
				template <std::ranges::range>
				constexpr bool test() { return false; }
				static_assert(test<View>());
				}

				namespace subsume_movable {
				template <std::ranges::view>
				constexpr bool test() { return true; }
				template <std::movable>
				constexpr bool test() { return false; }
				static_assert(test<View>());
				}

				namespace subsume_default_initializable {
				template <std::ranges::view>
				constexpr bool test() { return true; }
				template <std::default_initializable>
				constexpr bool test() { return false; }
				static_assert(test<View>());
				}