| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // template<class T> |
| // concept input_iterator; |
| |
| // std::ranges::forward_range |
| |
| #include <ranges> |
| |
| #include <iterator> |
| |
| struct range { |
| int* begin(); |
| int* end(); |
| }; |
| |
| template<std::ranges::range R> |
| requires std::input_iterator<std::ranges::iterator_t<R>> |
| constexpr bool check_input_range_subsumption() { |
| return false; |
| } |
| |
| template<std::ranges::input_range> |
| requires true |
| constexpr bool check_input_range_subsumption() { |
| return true; |
| } |
| |
| static_assert(check_input_range_subsumption<range>()); |
| |
| template<std::ranges::input_range R> |
| requires std::forward_iterator<std::ranges::iterator_t<R>> |
| constexpr bool check_forward_range_subsumption() { |
| return false; |
| } |
| |
| template<std::ranges::forward_range> |
| requires true |
| constexpr bool check_forward_range_subsumption() { |
| return true; |
| } |
| |
| static_assert(check_forward_range_subsumption<range>()); |
| |
| template<std::ranges::forward_range R> |
| requires std::bidirectional_iterator<std::ranges::iterator_t<R>> |
| constexpr bool check_bidirectional_range_subsumption() { |
| return false; |
| } |
| |
| template<std::ranges::bidirectional_range> |
| requires true |
| constexpr bool check_bidirectional_range_subsumption() { |
| return true; |
| } |
| |
| static_assert(check_bidirectional_range_subsumption<range>()); |
| |
| template<std::ranges::bidirectional_range R> |
| requires std::random_access_iterator<std::ranges::iterator_t<R>> |
| constexpr bool check_random_access_range_subsumption() { |
| return false; |
| } |
| |
| template<std::ranges::random_access_range> |
| requires true |
| constexpr bool check_random_access_range_subsumption() { |
| return true; |
| } |
| |
| static_assert(check_random_access_range_subsumption<range>()); |
| |
| template<std::ranges::random_access_range R> |
| requires std::random_access_iterator<std::ranges::iterator_t<R>> |
| constexpr bool check_contiguous_range_subsumption() { |
| return false; |
| } |
| |
| template<std::ranges::contiguous_range> |
| requires true |
| constexpr bool check_contiguous_range_subsumption() { |
| return true; |
| } |
| |
| static_assert(check_contiguous_range_subsumption<range>()); |