42 lines
1.9 KiB
C++
42 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-no-concepts
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// template<viewable_range R>
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// using all_t = decltype(views::all(declval<R>()));
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#include <ranges>
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#include "test_iterators.h"
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#include "test_range.h"
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struct View : test_range<cpp20_input_iterator>, std::ranges::view_base { };
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struct Range : test_range<cpp20_input_iterator> { };
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struct BorrowableRange : test_range<forward_iterator> { };
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
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// When T is a view, returns decay-copy(T)
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ASSERT_SAME_TYPE(std::views::all_t<View>, View);
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ASSERT_SAME_TYPE(std::views::all_t<View&>, View);
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ASSERT_SAME_TYPE(std::views::all_t<View const>, View);
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ASSERT_SAME_TYPE(std::views::all_t<View const&>, View);
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// Otherwise, when T is a reference to a range, returns ref_view<T>
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ASSERT_SAME_TYPE(std::views::all_t<Range&>, std::ranges::ref_view<Range>);
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ASSERT_SAME_TYPE(std::views::all_t<Range const&>, std::ranges::ref_view<Range const>);
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ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&>, std::ranges::ref_view<BorrowableRange>);
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ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange const&>, std::ranges::ref_view<BorrowableRange const>);
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// Otherwise, returns subrange<iterator_t<T>, sentinel_t<R>>
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ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange>, std::ranges::subrange<forward_iterator<int*>, sentinel>);
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ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange const>, std::ranges::subrange<forward_iterator<int const*>, sentinel>);
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