| //===----------------------------------------------------------------------===// |
| // |
| // 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 <cassert> |
| #include <ranges> |
| #include <type_traits> |
| #include <utility> |
| |
| #include "test_iterators.h" |
| |
| struct View : std::ranges::view_base { |
| int* begin() const; |
| int* end() const; |
| }; |
| |
| // Test that end is not const |
| template <class T> |
| concept HasEnd = requires(T t) { t.end(); }; |
| |
| struct Pred { |
| constexpr bool operator()(int i) const { return i < 3; } |
| }; |
| |
| static_assert(HasEnd<std::ranges::drop_while_view<View, Pred>>); |
| static_assert(!HasEnd<const std::ranges::drop_while_view<View, Pred>>); |
| |
| constexpr bool test() { |
| // return iterator |
| { |
| int buffer[] = {1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1}; |
| std::ranges::drop_while_view dwv(buffer, Pred{}); |
| std::same_as<int*> decltype(auto) st = dwv.end(); |
| assert(st == buffer + 11); |
| } |
| |
| // return sentinel |
| { |
| using Iter = int*; |
| using Sent = sentinel_wrapper<Iter>; |
| using Range = std::ranges::subrange<Iter, Sent>; |
| int buffer[] = {1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1}; |
| Range range = {buffer, Sent{buffer + 11}}; |
| std::ranges::drop_while_view dwv(range, Pred{}); |
| std::same_as<Sent> decltype(auto) st = dwv.end(); |
| assert(base(st) == buffer + 11); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| return 0; |
| } |