forked from OSchip/llvm-project
90 lines
2.9 KiB
C++
90 lines
2.9 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 auto begin() requires (!simple-view<V>);
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// constexpr auto begin() const requires range<const V>;
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#include <ranges>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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#include "test_range.h"
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#include "types.h"
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struct NonCommonSimpleView : std::ranges::view_base {
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int* begin() const;
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sentinel_wrapper<int*> end() const;
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size_t size() { return 0; } // deliberately non-const
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};
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static_assert(std::ranges::sized_range<NonCommonSimpleView>);
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static_assert(!std::ranges::sized_range<const NonCommonSimpleView>);
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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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// sized_range && random_access_iterator
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{
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std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView(buffer), 4);
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assert(tv.begin() == SizedRandomAccessView(buffer).begin());
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ASSERT_SAME_TYPE(decltype(tv.begin()), RandomAccessIter);
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}
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{
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const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView(buffer), 4);
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assert(tv.begin() == SizedRandomAccessView(buffer).begin());
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ASSERT_SAME_TYPE(decltype(tv.begin()), RandomAccessIter);
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}
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// sized_range && !random_access_iterator
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{
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std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 4);
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assert(tv.begin() == std::counted_iterator<ForwardIter>(ForwardIter(buffer), 4));
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ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<ForwardIter>);
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}
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{
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const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 4);
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assert(tv.begin() == std::counted_iterator<ForwardIter>(ForwardIter(buffer), 4));
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ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<ForwardIter>);
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}
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// !sized_range
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{
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std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
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assert(tv.begin() == std::counted_iterator<int*>(buffer, 4));
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ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<int*>);
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}
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{
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const std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 4);
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assert(tv.begin() == std::counted_iterator<int*>(buffer, 4));
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ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<int*>);
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}
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// __simple_view<V> && sized_range<V> && !size_range<!V>
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{
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std::ranges::take_view<NonCommonSimpleView> tv{};
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ASSERT_SAME_TYPE(decltype(tv.begin()), std::counted_iterator<int*>);
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ASSERT_SAME_TYPE(decltype(std::as_const(tv).begin()), std::counted_iterator<int*>);
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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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