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

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libcxx/test/std/ranges/range.view/enable_view.compile.pass.cpp

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				//===----------------------------------------------------------------------===//
				//
				// 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>
				// inline constexpr bool enable_view = ...;

				#include <ranges>

				#include "test_macros.h"

				// Doesn't derive from view_base
				struct Empty { };
				static_assert(!std::ranges::enable_view<Empty>);

				zoecarverUnsubmitted Done Reply Inline Actions What if you named these more like the types in the other test file? So this would be `Empty`, next would be `PrivateViewBase`, then `EnableViewFalse`, then `DerivesViewBase`, then `EnableViewTrue` (or something similar). zoecarver: What if you named these more like the types in the other test file? So this would be `Empty`…
				// Derives from view_base, but privately
				struct PrivateViewBase : private std::ranges::view_base { };
				static_assert(!std::ranges::enable_view<PrivateViewBase>);

				// Derives from view_base, but specializes enable_view to false
				struct EnableViewFalse : std::ranges::view_base { };
				namespace std::ranges { template <> constexpr bool enable_view<EnableViewFalse> = false; }
				static_assert(!std::ranges::enable_view<EnableViewFalse>);


				// Derives from view_base
				struct PublicViewBase : std::ranges::view_base { };
				static_assert(std::ranges::enable_view<PublicViewBase>);

				// Does not derive from view_base, but specializes enable_view to true
				struct EnableViewTrue { };
				namespace std::ranges { template <> constexpr bool enable_view<EnableViewTrue> = true; }
				static_assert(std::ranges::enable_view<EnableViewTrue>);


				// Make sure that enable_view is a bool, not some other contextually-convertible-to-bool type.
				ASSERT_SAME_TYPE(decltype(std::ranges::enable_view<Empty>), const bool);
				ASSERT_SAME_TYPE(decltype(std::ranges::enable_view<PublicViewBase>), const bool);