83 lines
2.5 KiB
C++
83 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 auto end() requires (!simple-view<V>)
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// constexpr auto end() 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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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}, 0);
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assert(tv.end() == std::ranges::next(tv.begin(), 0));
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ASSERT_SAME_TYPE(decltype(tv.end()), RandomAccessIter);
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}
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{
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const std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 1);
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assert(tv.end() == std::ranges::next(tv.begin(), 1));
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ASSERT_SAME_TYPE(decltype(tv.end()), 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}, 2);
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assert(tv.end() == std::ranges::next(tv.begin(), 2));
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ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
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}
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{
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const std::ranges::take_view<SizedForwardView> tv(SizedForwardView{buffer}, 3);
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assert(tv.end() == std::ranges::next(tv.begin(), 3));
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ASSERT_SAME_TYPE(decltype(tv.end()), std::default_sentinel_t);
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}
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// !sized_range
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{
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std::ranges::take_view<ContiguousView> tv(ContiguousView{buffer}, 4);
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assert(tv.end() == std::ranges::next(tv.begin(), 4));
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// The <sentinel> type.
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static_assert(!std::same_as<decltype(tv.end()), std::default_sentinel_t>);
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static_assert(!std::same_as<decltype(tv.end()), int*>);
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}
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{
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const std::ranges::take_view<ContiguousView> tv(ContiguousView{buffer}, 5);
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assert(tv.end() == std::ranges::next(tv.begin(), 5));
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}
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// Just to cover the case where count == 8.
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{
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std::ranges::take_view<SizedRandomAccessView> tv(SizedRandomAccessView{buffer}, 8);
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assert(tv.end() == std::ranges::next(tv.begin(), 8));
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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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