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 // sentinel() = default; 12 13 #include <cassert> 14 #include <ranges> 15 16 struct Sent { 17 bool b; // deliberately uninitialised 18 operator ==(int *,const Sent & s)19 friend constexpr bool operator==(int*, const Sent& s) { return s.b; } 20 }; 21 22 struct Range : std::ranges::view_base { 23 int* begin() const; 24 Sent end(); 25 }; 26 test()27constexpr bool test() { 28 { 29 using R = std::ranges::take_while_view<Range, bool (*)(int)>; 30 using Sentinel = std::ranges::sentinel_t<R>; 31 32 Sentinel s1 = {}; 33 assert(!s1.base().b); 34 } 35 return true; 36 } 37 main(int,char **)38int main(int, char**) { 39 test(); 40 static_assert(test()); 41 42 return 0; 43 } 44