| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // ranges::prev(it) |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_iterators.h" |
| |
| template <class It> |
| constexpr void check(int* first, int* expected) { |
| It it(first); |
| std::same_as<It> auto result = std::ranges::prev(std::move(it)); |
| assert(base(result) == expected); |
| } |
| |
| constexpr bool test() { |
| int range[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; |
| |
| for (int n = 1; n != 10; ++n) { |
| check<bidirectional_iterator<int*>>(range+n, range+n-1); |
| check<random_access_iterator<int*>>(range+n, range+n-1); |
| check<contiguous_iterator<int*>>( range+n, range+n-1); |
| check<int*>( range+n, range+n-1); |
| } |
| |
| return true; |
| } |
| |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| return 0; |
| } |