40 lines
1005 B
C++
40 lines
1005 B
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
|
|
// template<class T>
|
|
// concept input_iterator;
|
|
|
|
#include <ranges>
|
|
|
|
#include <iterator>
|
|
|
|
struct range {
|
|
int* begin();
|
|
int* end();
|
|
};
|
|
|
|
// clang-format off
|
|
template<std::ranges::range R>
|
|
requires std::input_iterator<std::ranges::iterator_t<R> >
|
|
[[nodiscard]] constexpr bool check_input_range_subsumption() {
|
|
return false;
|
|
}
|
|
|
|
template<std::ranges::input_range>
|
|
requires true
|
|
[[nodiscard]] constexpr bool check_input_range_subsumption() {
|
|
return true;
|
|
}
|
|
// clang-format on
|
|
|
|
static_assert(check_input_range_subsumption<range>());
|