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 10 // 11 // template<class T, class Pred> 12 // inline constexpr bool enable_borrowed_range<drop_while_view<T, Pred>> = 13 // enable_borrowed_range<T>; 14 15 #include <ranges> 16 17 struct NonBorrowed : std::ranges::view_base { 18 int* begin(); 19 int* end(); 20 }; 21 22 struct Borrowed : std::ranges::view_base { 23 int* begin(); 24 int* end(); 25 }; 26 27 struct Pred { 28 bool operator()(int) const; 29 }; 30 31 template <> 32 inline constexpr bool std::ranges::enable_borrowed_range<Borrowed> = true; 33 34 static_assert(!std::ranges::borrowed_range<std::ranges::drop_while_view<NonBorrowed, Pred>>); 35 static_assert(std::ranges::borrowed_range<std::ranges::drop_while_view<Borrowed, Pred>>); 36