73 lines
2.7 KiB
C++
73 lines
2.7 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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// explicit join_view(R&&) -> join_view<views::all_t<R>>;
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#include <ranges>
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#include "test_iterators.h"
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template<class T>
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struct View : std::ranges::view_base {
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// All friends here are defined to prevent GCC warnings.
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friend T* begin(View&) { return nullptr; }
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friend T* begin(View const&) { return nullptr; }
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friend sentinel_wrapper<T*> end(View&) { return sentinel_wrapper<T*>(nullptr); }
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friend sentinel_wrapper<T*> end(View const&) { return sentinel_wrapper<T*>(nullptr); }
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};
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template<class T>
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struct Range {
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friend T* begin(Range&) { return nullptr; }
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friend T* begin(Range const&) { return nullptr; }
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friend sentinel_wrapper<T*> end(Range&) { return sentinel_wrapper<T*>(nullptr); }
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friend sentinel_wrapper<T*> end(Range const&) { return sentinel_wrapper<T*>(nullptr); }
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};
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template<class T>
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struct BorrowedRange {
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friend T* begin(BorrowedRange&) { return nullptr; }
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friend T* begin(BorrowedRange const&) { return nullptr; }
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friend sentinel_wrapper<T*> end(BorrowedRange&) { return sentinel_wrapper<T*>(nullptr); }
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friend sentinel_wrapper<T*> end(BorrowedRange const&) { return sentinel_wrapper<T*>(nullptr); }
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};
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template<>
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inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange<BorrowedRange<int>>> = true;
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void testCTAD() {
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View<View<int>> v;
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Range<Range<int>> r;
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BorrowedRange<BorrowedRange<int>> br;
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static_assert(std::same_as<
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decltype(std::ranges::join_view(v)),
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std::ranges::join_view<View<View<int>>>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(r)),
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std::ranges::join_view<std::ranges::ref_view<Range<Range<int>>>>
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>);
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// std::ranges::join_view(std::move(r)) invalid. RValue range must be borrowed.
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static_assert(std::same_as<
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decltype(std::ranges::join_view(br)),
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std::ranges::join_view<std::ranges::ref_view<BorrowedRange<BorrowedRange<int>>>>
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>);
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static_assert(std::same_as<
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decltype(std::ranges::join_view(std::move(br))),
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std::ranges::join_view<std::ranges::subrange<BorrowedRange<int> *,
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sentinel_wrapper<BorrowedRange<int> *>,
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std::ranges::subrange_kind::unsized>>
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>);
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}
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