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 10 11 // <string> 12 13 // basic_string<charT,traits,Allocator>& 14 // operator=(basic_string<charT,traits,Allocator>&& str); // constexpr since C++20 15 16 #include <string> 17 #include <cassert> 18 19 #include "test_macros.h" 20 21 TEST_CONSTEXPR_CXX20 bool test() { 22 // Test that assignment from {} and {ptr, len} are allowed and are not 23 // ambiguous. 24 { 25 std::string s = "hello world"; 26 s = {}; 27 assert(s.empty()); 28 } 29 { 30 std::string s = "hello world"; 31 s = {"abc", 2}; 32 assert(s == "ab"); 33 } 34 35 return true; 36 } 37 38 int main(int, char**) 39 { 40 test(); 41 #if TEST_STD_VER > 17 42 static_assert(test()); 43 #endif 44 45 return 0; 46 } 47