59 lines
1.8 KiB
C++
59 lines
1.8 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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// reverse_view() requires default_initializable<V> = default;
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#include <ranges>
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#include <cassert>
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#include "types.h"
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enum CtorKind { DefaultCtor, PtrCtor };
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template<CtorKind CK>
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struct BidirRangeWith : std::ranges::view_base {
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int *ptr_ = nullptr;
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constexpr BidirRangeWith() requires (CK == DefaultCtor) = default;
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constexpr BidirRangeWith(int *ptr);
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constexpr bidirectional_iterator<int*> begin() { return bidirectional_iterator<int*>{ptr_}; }
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constexpr bidirectional_iterator<const int*> begin() const { return bidirectional_iterator<const int*>{ptr_}; }
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constexpr bidirectional_iterator<int*> end() { return bidirectional_iterator<int*>{ptr_ + 8}; }
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constexpr bidirectional_iterator<const int*> end() const { return bidirectional_iterator<const int*>{ptr_ + 8}; }
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};
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constexpr bool test() {
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{
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static_assert( std::default_initializable<std::ranges::reverse_view<BidirRangeWith<DefaultCtor>>>);
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static_assert(!std::default_initializable<std::ranges::reverse_view<BidirRangeWith<PtrCtor>>>);
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}
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{
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std::ranges::reverse_view<BidirRangeWith<DefaultCtor>> rev;
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assert(rev.base().ptr_ == nullptr);
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}
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{
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const std::ranges::reverse_view<BidirRangeWith<DefaultCtor>> rev;
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assert(rev.base().ptr_ == nullptr);
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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