| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-ranges |
| |
| // constexpr auto begin(); |
| // constexpr auto begin() const requires range<const V>; |
| |
| #include <ranges> |
| |
| #include <cassert> |
| #include <concepts> |
| #include <utility> |
| |
| #include "test_iterators.h" |
| #include "types.h" |
| |
| struct MutableView : std::ranges::view_base { |
| int* begin(); |
| sentinel_wrapper<int*> end(); |
| }; |
| |
| template<class View> |
| concept BeginEnabled = requires(View v) { v.begin(); }; |
| |
| constexpr bool test() { |
| int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| { |
| static_assert( BeginEnabled<std::ranges::common_view<CopyableView> const&>); |
| static_assert( BeginEnabled<std::ranges::common_view<MutableView>&>); |
| static_assert(!BeginEnabled<std::ranges::common_view<MutableView> const&>); |
| } |
| |
| { |
| SizedRandomAccessView view{buf, buf + 8}; |
| std::ranges::common_view<SizedRandomAccessView> common(view); |
| std::same_as<RandomAccessIter> auto begin = common.begin(); |
| assert(begin == std::ranges::begin(view)); |
| } |
| |
| { |
| SizedRandomAccessView view{buf, buf + 8}; |
| std::ranges::common_view<SizedRandomAccessView> const common(view); |
| std::same_as<RandomAccessIter> auto begin = common.begin(); |
| assert(begin == std::ranges::begin(view)); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| // The non-constexpr tests: |
| int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| { |
| SizedForwardView view{buf, buf + 8}; |
| std::ranges::common_view<SizedForwardView> common(view); |
| using CommonIter = std::common_iterator<ForwardIter, sentinel_wrapper<ForwardIter>>; |
| std::same_as<CommonIter> auto begin = common.begin(); |
| assert(begin == std::ranges::begin(view)); |
| } |
| { |
| SizedForwardView view{buf, buf + 8}; |
| std::ranges::common_view<SizedForwardView> const common(view); |
| using CommonIter = std::common_iterator<ForwardIter, sentinel_wrapper<ForwardIter>>; |
| std::same_as<CommonIter> auto begin = common.begin(); |
| assert(begin == std::ranges::begin(view)); |
| } |
| |
| { |
| MoveOnlyView view{buf, buf + 8}; |
| std::ranges::common_view<MoveOnlyView> common(std::move(view)); |
| using CommonIter = std::common_iterator<int*, sentinel_wrapper<int*>>; |
| std::same_as<CommonIter> auto begin = common.begin(); |
| assert(begin == std::ranges::begin(view)); |
| } |
| |
| { |
| CopyableView view{buf, buf + 8}; |
| std::ranges::common_view<CopyableView> const common(view); |
| using CommonIter = std::common_iterator<int*, sentinel_wrapper<int*>>; |
| std::same_as<CommonIter> auto begin = common.begin(); |
| assert(begin == std::ranges::begin(view)); |
| } |
| |
| return 0; |
| } |