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