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 // assign(basic_string<charT,traits>&& str); // constexpr since C++20 13 14 #include <string> 15 #include <utility> 16 #include <cassert> 17 18 #include "test_macros.h" 19 #include "min_allocator.h" 20 21 template <class S> 22 TEST_CONSTEXPR_CXX20 void 23 test(S s, S str, S expected) 24 { 25 s.assign(std::move(str)); 26 LIBCPP_ASSERT(s.__invariants()); 27 assert(s == expected); 28 } 29 30 template <class S> 31 TEST_CONSTEXPR_CXX20 void test_string() { 32 test(S(), S(), S()); 33 test(S(), S("12345"), S("12345")); 34 test(S(), S("1234567890"), S("1234567890")); 35 test(S(), S("12345678901234567890"), S("12345678901234567890")); 36 37 test(S("12345"), S(), S()); 38 test(S("12345"), S("12345"), S("12345")); 39 test(S("12345"), S("1234567890"), S("1234567890")); 40 test(S("12345"), S("12345678901234567890"), S("12345678901234567890")); 41 42 test(S("1234567890"), S(), S()); 43 test(S("1234567890"), S("12345"), S("12345")); 44 test(S("1234567890"), S("1234567890"), S("1234567890")); 45 test(S("1234567890"), S("12345678901234567890"), S("12345678901234567890")); 46 47 test(S("12345678901234567890"), S(), S()); 48 test(S("12345678901234567890"), S("12345"), S("12345")); 49 test(S("12345678901234567890"), S("1234567890"), S("1234567890")); 50 test(S("12345678901234567890"), S("12345678901234567890"), 51 S("12345678901234567890")); 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