73 lines
2.5 KiB
C++
73 lines
2.5 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<class R>
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// reverse_view(R&&) -> reverse_view<views::all_t<R>>;
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#include <ranges>
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#include <concepts>
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#include <utility>
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#include "test_iterators.h"
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struct View : std::ranges::view_base {
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friend int* begin(View&) { return nullptr; }
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friend int* begin(View const&) { return nullptr; }
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friend sentinel_wrapper<int*> end(View&) { return sentinel_wrapper<int*>(nullptr); }
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friend sentinel_wrapper<int*> end(View const&) { return sentinel_wrapper<int*>(nullptr); }
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};
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struct Range {
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friend int* begin(Range&) { return nullptr; }
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friend int* begin(Range const&) { return nullptr; }
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friend sentinel_wrapper<int*> end(Range&) { return sentinel_wrapper<int*>(nullptr); }
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friend sentinel_wrapper<int*> end(Range const&) { return sentinel_wrapper<int*>(nullptr); }
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};
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struct BorrowedRange {
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friend int* begin(BorrowedRange&) { return nullptr; }
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friend int* begin(BorrowedRange const&) { return nullptr; }
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friend sentinel_wrapper<int*> end(BorrowedRange&) { return sentinel_wrapper<int*>(nullptr); }
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friend sentinel_wrapper<int*> end(BorrowedRange const&) { return sentinel_wrapper<int*>(nullptr); }
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};
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
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int main(int, char**) {
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View v;
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Range r;
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BorrowedRange br;
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{
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std::same_as<std::ranges::reverse_view<View>> auto x = std::ranges::reverse_view(v);
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(void)x;
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}
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{
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std::same_as<std::ranges::reverse_view<std::ranges::ref_view<Range>>> auto x = std::ranges::reverse_view(r);
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(void)x;
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// std::ranges::reverse_view(std::move(r)) is invalid. RValue range must be borrowed.
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}
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{
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std::same_as<std::ranges::reverse_view<std::ranges::ref_view<BorrowedRange>>> auto x = std::ranges::reverse_view(br);
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(void)x;
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}
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{
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using Subrange = std::ranges::subrange<int *, sentinel_wrapper<int *>, std::ranges::subrange_kind::unsized>;
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std::same_as<std::ranges::reverse_view<Subrange>> auto x = std::ranges::reverse_view(std::move(br));
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(void)x;
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}
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return 0;
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}
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