1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 10 11 // constexpr iterator& operator-=(difference_type n); 12 13 #include <ranges> 14 #include <cassert> 15 #include <concepts> 16 test()17constexpr bool test() { 18 using Iter = std::ranges::iterator_t<std::ranges::repeat_view<int>>; 19 std::ranges::repeat_view<int> v(10); 20 auto iter = v.begin() + 10; 21 iter -= 5; 22 assert(iter == v.begin() + 5); 23 24 static_assert(std::same_as<decltype(iter -= 5), Iter&>); 25 26 return true; 27 } 28 main(int,char **)29int main(int, char**) { 30 test(); 31 static_assert(test()); 32 33 return 0; 34 } 35