65 lines
2.3 KiB
C++
65 lines
2.3 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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struct View : std::ranges::view_base {
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int *begin() const;
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int *end() const;
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};
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struct Range {
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int *begin() const;
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int *end() const;
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};
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struct BorrowableRange {
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int *begin() const;
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int *end() const;
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};
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
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template <class T>
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concept HasAllT = requires {
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typename std::views::all_t<T>;
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};
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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&&>, View);
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ASSERT_SAME_TYPE(std::views::all_t<const View>, View);
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ASSERT_SAME_TYPE(std::views::all_t<const View&>, View);
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ASSERT_SAME_TYPE(std::views::all_t<const View&&>, 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<const Range&>, std::ranges::ref_view<const Range>);
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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<const BorrowableRange&>, std::ranges::ref_view<const BorrowableRange>);
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// Otherwise, returns owning_view<T>
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ASSERT_SAME_TYPE(std::views::all_t<Range>, std::ranges::owning_view<Range>);
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ASSERT_SAME_TYPE(std::views::all_t<Range&&>, std::ranges::owning_view<Range>);
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static_assert(!HasAllT<const Range>);
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static_assert(!HasAllT<const Range&&>);
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ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange>, std::ranges::owning_view<BorrowableRange>);
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ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&&>, std::ranges::owning_view<BorrowableRange>);
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static_assert(!HasAllT<const BorrowableRange>);
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static_assert(!HasAllT<const BorrowableRange&&>);
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