forked from OSchip/llvm-project
82 lines
2.5 KiB
C++
82 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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// constexpr explicit common_view(V r);
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#include <ranges>
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#include <cassert>
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#include "test_iterators.h"
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#include "test_range.h"
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struct ContiguousView : std::ranges::view_base {
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int *ptr_;
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constexpr ContiguousView(int* ptr) : ptr_(ptr) {}
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constexpr ContiguousView(ContiguousView&&) = default;
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constexpr ContiguousView& operator=(ContiguousView&&) = default;
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friend constexpr int* begin(ContiguousView& view) { return view.ptr_; }
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friend constexpr int* begin(ContiguousView const& view) { return view.ptr_; }
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friend constexpr sentinel_wrapper<int*> end(ContiguousView& view) {
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return sentinel_wrapper<int*>{view.ptr_ + 8};
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}
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friend constexpr sentinel_wrapper<int*> end(ContiguousView const& view) {
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return sentinel_wrapper<int*>{view.ptr_ + 8};
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}
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};
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struct CopyableView : std::ranges::view_base {
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int *ptr_;
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constexpr CopyableView(int* ptr) : ptr_(ptr) {}
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friend constexpr int* begin(CopyableView& view) { return view.ptr_; }
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friend constexpr int* begin(CopyableView const& view) { return view.ptr_; }
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friend constexpr sentinel_wrapper<int*> end(CopyableView& view) {
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return sentinel_wrapper<int*>{view.ptr_ + 8};
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}
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friend constexpr sentinel_wrapper<int*> end(CopyableView const& view) {
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return sentinel_wrapper<int*>{view.ptr_ + 8};
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}
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};
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constexpr bool test() {
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int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
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{
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std::ranges::common_view<ContiguousView> common(ContiguousView{buffer});
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assert(std::move(common).base().ptr_ == buffer);
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}
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{
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ContiguousView v{buffer};
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std::ranges::common_view<ContiguousView> common(std::move(v));
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assert(std::move(common).base().ptr_ == buffer);
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}
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{
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const CopyableView v{buffer};
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const std::ranges::common_view<CopyableView> common(v);
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assert(common.base().ptr_ == buffer);
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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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int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
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const std::ranges::common_view<ContiguousView> common(ContiguousView{buffer});
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assert(common.begin() == buffer);
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return 0;
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}
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