| //===----------------------------------------------------------------------===// |
| // |
| // 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: gcc-10 |
| |
| // friend constexpr iter_difference_t<I> operator-( |
| // const counted_iterator& x, default_sentinel_t); |
| // friend constexpr iter_difference_t<I> operator-( |
| // default_sentinel_t, const counted_iterator& y); |
| |
| #include <iterator> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| constexpr bool test() { |
| int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| { |
| std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8); |
| assert(iter - std::default_sentinel == -8); |
| assert(std::default_sentinel - iter == 8); |
| assert(iter.count() == 8); |
| |
| ASSERT_SAME_TYPE(decltype(iter - std::default_sentinel), std::iter_difference_t<int*>); |
| ASSERT_SAME_TYPE(decltype(std::default_sentinel - iter), std::iter_difference_t<int*>); |
| } |
| { |
| const std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8); |
| assert(iter - std::default_sentinel == -8); |
| assert(std::default_sentinel - iter == 8); |
| assert(iter.count() == 8); |
| |
| ASSERT_SAME_TYPE(decltype(iter - std::default_sentinel), std::iter_difference_t<int*>); |
| ASSERT_SAME_TYPE(decltype(std::default_sentinel - iter), std::iter_difference_t<int*>); |
| } |
| { |
| std::counted_iterator iter(forward_iterator<int*>{buffer}, 8); |
| assert(iter - std::default_sentinel == -8); |
| assert(std::default_sentinel - iter == 8); |
| assert(iter.count() == 8); |
| |
| ASSERT_SAME_TYPE(decltype(iter - std::default_sentinel), std::iter_difference_t<int*>); |
| ASSERT_SAME_TYPE(decltype(std::default_sentinel - iter), std::iter_difference_t<int*>); |
| } |
| { |
| const std::counted_iterator iter(forward_iterator<int*>{buffer}, 8); |
| assert(iter - std::default_sentinel == -8); |
| assert(std::default_sentinel - iter == 8); |
| assert(iter.count() == 8); |
| |
| ASSERT_SAME_TYPE(decltype(iter - std::default_sentinel), std::iter_difference_t<int*>); |
| ASSERT_SAME_TYPE(decltype(std::default_sentinel - iter), std::iter_difference_t<int*>); |
| } |
| { |
| std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8); |
| assert(iter - std::default_sentinel == -8); |
| assert(std::default_sentinel - iter == 8); |
| assert(iter.count() == 8); |
| |
| ASSERT_SAME_TYPE(decltype(iter - std::default_sentinel), std::iter_difference_t<int*>); |
| ASSERT_SAME_TYPE(decltype(std::default_sentinel - iter), std::iter_difference_t<int*>); |
| } |
| { |
| const std::counted_iterator iter(cpp20_input_iterator<int*>{buffer}, 8); |
| assert(iter - std::default_sentinel == -8); |
| assert(std::default_sentinel - iter == 8); |
| assert(iter.count() == 8); |
| |
| ASSERT_SAME_TYPE(decltype(iter - std::default_sentinel), std::iter_difference_t<int*>); |
| ASSERT_SAME_TYPE(decltype(std::default_sentinel - iter), std::iter_difference_t<int*>); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |