| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // constexpr auto end(); |
| |
| #include <ranges> |
| |
| #include <cassert> |
| #include <concepts> |
| #include <type_traits> |
| #include "test_iterators.h" |
| |
| struct Range : std::ranges::view_base { |
| using Iterator = forward_iterator<int*>; |
| using Sentinel = sentinel_wrapper<Iterator>; |
| constexpr explicit Range(int* b, int* e) : begin_(b), end_(e) { } |
| constexpr Iterator begin() const { return Iterator(begin_); } |
| constexpr Sentinel end() const { return Sentinel(Iterator(end_)); } |
| |
| private: |
| int* begin_; |
| int* end_; |
| }; |
| |
| struct CommonRange : std::ranges::view_base { |
| using Iterator = forward_iterator<int*>; |
| constexpr explicit CommonRange(int* b, int* e) : begin_(b), end_(e) { } |
| constexpr Iterator begin() const { return Iterator(begin_); } |
| constexpr Iterator end() const { return Iterator(end_); } |
| |
| private: |
| int* begin_; |
| int* end_; |
| }; |
| |
| constexpr bool test() { |
| int buff[] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| // Check the return type of `.end()` |
| { |
| Range range(buff, buff + 1); |
| auto pred = [](int) { return true; }; |
| std::ranges::filter_view view(range, pred); |
| using FilterSentinel = std::ranges::sentinel_t<decltype(view)>; |
| ASSERT_SAME_TYPE(FilterSentinel, decltype(view.end())); |
| } |
| |
| // end() on an empty range |
| { |
| Range range(buff, buff); |
| auto pred = [](int) { return true; }; |
| std::ranges::filter_view view(range, pred); |
| auto end = view.end(); |
| assert(base(base(end.base())) == buff); |
| } |
| |
| // end() on a 1-element range |
| { |
| Range range(buff, buff + 1); |
| auto pred = [](int) { return true; }; |
| std::ranges::filter_view view(range, pred); |
| auto end = view.end(); |
| assert(base(base(end.base())) == buff + 1); |
| static_assert(!std::is_same_v<decltype(end), decltype(view.begin())>); |
| } |
| |
| // end() on a 2-element range |
| { |
| Range range(buff, buff + 2); |
| auto pred = [](int) { return true; }; |
| std::ranges::filter_view view(range, pred); |
| auto end = view.end(); |
| assert(base(base(end.base())) == buff + 2); |
| static_assert(!std::is_same_v<decltype(end), decltype(view.begin())>); |
| } |
| |
| // end() on a N-element range |
| { |
| for (int k = 1; k != 8; ++k) { |
| Range range(buff, buff + 8); |
| auto pred = [=](int i) { return i == k; }; |
| std::ranges::filter_view view(range, pred); |
| auto end = view.end(); |
| assert(base(base(end.base())) == buff + 8); |
| static_assert(!std::is_same_v<decltype(end), decltype(view.begin())>); |
| } |
| } |
| |
| // end() on a common_range |
| { |
| CommonRange range(buff, buff + 8); |
| auto pred = [](int i) { return i % 2 == 0; }; |
| std::ranges::filter_view view(range, pred); |
| auto end = view.end(); |
| assert(base(end.base()) == buff + 8); |
| static_assert(std::is_same_v<decltype(end), decltype(view.begin())>); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |