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 // <vector> 10 11 // reference(const reference&) 12 13 #include <cassert> 14 #include <vector> 15 16 #include "test_macros.h" 17 test()18TEST_CONSTEXPR_CXX20 bool test() { 19 std::vector<bool> vec; 20 typedef std::vector<bool>::reference Ref; 21 vec.push_back(true); 22 Ref ref = vec[0]; 23 Ref ref2 = ref; 24 assert(ref == ref2 && ref2); 25 ref.flip(); 26 assert(ref == ref2 && !ref2); 27 28 return true; 29 } 30 main(int,char **)31int main(int, char**) { 32 test(); 33 #if TEST_STD_VER > 17 34 static_assert(test()); 35 #endif 36 37 return 0; 38 } 39