92 lines
2.7 KiB
C++
92 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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// constexpr auto begin();
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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 <concepts>
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#include <utility>
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#include "test_iterators.h"
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#include "types.h"
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struct MutableView : std::ranges::view_base {
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int* begin();
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sentinel_wrapper<int*> end();
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};
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template<class View>
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concept BeginEnabled = requires(View v) { v.begin(); };
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constexpr bool test() {
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int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
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{
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static_assert( BeginEnabled<std::ranges::common_view<CopyableView> const&>);
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static_assert( BeginEnabled<std::ranges::common_view<MutableView>&>);
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static_assert(!BeginEnabled<std::ranges::common_view<MutableView> const&>);
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}
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{
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SizedRandomAccessView view{buf, buf + 8};
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std::ranges::common_view<SizedRandomAccessView> common(view);
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std::same_as<RandomAccessIter> auto begin = common.begin();
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assert(begin == std::ranges::begin(view));
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}
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{
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SizedRandomAccessView view{buf, buf + 8};
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std::ranges::common_view<SizedRandomAccessView> const common(view);
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std::same_as<RandomAccessIter> auto begin = common.begin();
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assert(begin == std::ranges::begin(view));
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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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// The non-constexpr tests:
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int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
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{
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SizedForwardView view{buf, buf + 8};
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std::ranges::common_view<SizedForwardView> common(view);
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using CommonIter = std::common_iterator<ForwardIter, sized_sentinel<ForwardIter>>;
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std::same_as<CommonIter> auto begin = common.begin();
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assert(begin == std::ranges::begin(view));
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std::same_as<CommonIter> auto cbegin = std::as_const(common).begin();
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assert(cbegin == std::ranges::begin(view));
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}
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{
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MoveOnlyView view{buf, buf + 8};
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std::ranges::common_view<MoveOnlyView> common(std::move(view));
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using CommonIter = std::common_iterator<int*, sentinel_wrapper<int*>>;
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std::same_as<CommonIter> auto begin = common.begin();
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assert(begin == std::ranges::begin(view));
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}
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{
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CopyableView view{buf, buf + 8};
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std::ranges::common_view<CopyableView> const common(view);
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using CommonIter = std::common_iterator<int*, sentinel_wrapper<int*>>;
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std::same_as<CommonIter> auto begin = common.begin();
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assert(begin == std::ranges::begin(view));
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}
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return 0;
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}
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