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 #include "test_allocator.h" 21 #include "min_allocator.h" 22 23 template <class S> 24 TEST_CONSTEXPR_CXX20 void 25 test(S s1, S s2) 26 { 27 S s0 = s2; 28 s1 = std::move(s2); 29 LIBCPP_ASSERT(s1.__invariants()); 30 LIBCPP_ASSERT(s2.__invariants()); 31 assert(s1 == s0); 32 assert(s1.capacity() >= s1.size()); 33 } 34 35 template <class S> 36 TEST_CONSTEXPR_CXX20 void test_string() { 37 test(S(), S()); 38 test(S("1"), S()); 39 test(S(), S("1")); 40 test(S("1"), S("2")); 41 test(S("1"), S("2")); 42 43 test(S(), 44 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 45 test(S("123456789"), 46 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 47 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 48 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 49 test(S("1234567890123456789012345678901234567890123456789012345678901234567890" 50 "1234567890123456789012345678901234567890123456789012345678901234567890"), 51 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 52 } 53 54 TEST_CONSTEXPR_CXX20 bool test() { 55 test_string<std::string>(); 56 #if TEST_STD_VER >= 11 57 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 58 #endif 59 60 return true; 61 } 62 63 int main(int, char**) 64 { 65 test(); 66 #if TEST_STD_VER > 17 67 static_assert(test()); 68 #endif 69 70 return 0; 71 } 72