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 // <string> 10 11 // basic_string<charT,traits,Allocator>& 12 // operator=(const basic_string<charT,traits,Allocator>& str); // constexpr since C++20 13 14 #include <string> 15 #include <cassert> 16 17 #include "test_macros.h" 18 #include "min_allocator.h" 19 20 template <class S> 21 TEST_CONSTEXPR_CXX20 void 22 test(S s1, const S& s2) 23 { 24 s1 = s2; 25 LIBCPP_ASSERT(s1.__invariants()); 26 assert(s1 == s2); 27 assert(s1.capacity() >= s1.size()); 28 } 29 30 TEST_CONSTEXPR_CXX20 bool test() { 31 { 32 typedef std::string S; 33 test(S(), S()); 34 test(S("1"), S()); 35 test(S(), S("1")); 36 test(S("1"), S("2")); 37 test(S("1"), S("2")); 38 39 test(S(), 40 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 41 test(S("123456789"), 42 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 43 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 44 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 45 test(S("1234567890123456789012345678901234567890123456789012345678901234567890" 46 "1234567890123456789012345678901234567890123456789012345678901234567890"), 47 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 48 } 49 #if TEST_STD_VER >= 11 50 { 51 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S; 52 test(S(), S()); 53 test(S("1"), S()); 54 test(S(), S("1")); 55 test(S("1"), S("2")); 56 test(S("1"), S("2")); 57 58 test(S(), 59 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 60 test(S("123456789"), 61 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 62 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 63 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 64 test(S("1234567890123456789012345678901234567890123456789012345678901234567890" 65 "1234567890123456789012345678901234567890123456789012345678901234567890"), 66 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 67 } 68 #endif 69 70 #if TEST_STD_VER > 3 71 { // LWG 2946 72 std::string s; 73 s = {"abc", 1}; 74 assert(s.size() == 1); 75 assert(s == "a"); 76 } 77 #endif 78 79 return true; 80 } 81 82 int main(int, char**) 83 { 84 test(); 85 #if TEST_STD_VER > 17 86 static_assert(test()); 87 #endif 88 89 return 0; 90 } 91