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 template <class S> 31 TEST_CONSTEXPR_CXX20 void test_string() { 32 test(S(), S()); 33 test(S("1"), S()); 34 test(S(), S("1")); 35 test(S("1"), S("2")); 36 test(S("1"), S("2")); 37 38 test(S(), 39 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 40 test(S("123456789"), 41 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 42 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 43 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 44 test(S("1234567890123456789012345678901234567890123456789012345678901234567890" 45 "1234567890123456789012345678901234567890123456789012345678901234567890"), 46 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")); 47 } 48 49 TEST_CONSTEXPR_CXX20 bool test() { 50 test_string<std::string>(); 51 #if TEST_STD_VER >= 11 52 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 53 #endif 54 55 #if TEST_STD_VER >= 11 56 { // LWG 2946 57 std::string s; 58 s = {"abc", 1}; 59 assert(s.size() == 1); 60 assert(s == "a"); 61 } 62 #endif 63 64 return true; 65 } 66 67 int main(int, char**) 68 { 69 test(); 70 #if TEST_STD_VER > 17 71 static_assert(test()); 72 #endif 73 74 return 0; 75 } 76