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 // append(const basic_string<charT,traits>& 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 s, S str, S expected) 23 { 24 s.append(str); 25 LIBCPP_ASSERT(s.__invariants()); 26 assert(s == expected); 27 } 28 29 template <class S> 30 TEST_CONSTEXPR_CXX20 void test_string() { 31 test(S(), S(), S()); 32 test(S(), S("12345"), S("12345")); 33 test(S(), S("1234567890"), S("1234567890")); 34 test(S(), S("12345678901234567890"), S("12345678901234567890")); 35 36 test(S("12345"), S(), S("12345")); 37 test(S("12345"), S("12345"), S("1234512345")); 38 test(S("12345"), S("1234567890"), S("123451234567890")); 39 test(S("12345"), S("12345678901234567890"), S("1234512345678901234567890")); 40 41 test(S("1234567890"), S(), S("1234567890")); 42 test(S("1234567890"), S("12345"), S("123456789012345")); 43 test(S("1234567890"), S("1234567890"), S("12345678901234567890")); 44 test(S("1234567890"), S("12345678901234567890"), S("123456789012345678901234567890")); 45 46 test(S("12345678901234567890"), S(), S("12345678901234567890")); 47 test(S("12345678901234567890"), S("12345"), S("1234567890123456789012345")); 48 test(S("12345678901234567890"), S("1234567890"), S("123456789012345678901234567890")); 49 test(S("12345678901234567890"), S("12345678901234567890"), 50 S("1234567890123456789012345678901234567890")); 51 } 52 53 TEST_CONSTEXPR_CXX20 bool test() { 54 test_string<std::string>(); 55 #if TEST_STD_VER >= 11 56 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 57 #endif 58 59 #if TEST_STD_VER >= 11 60 { // LWG 2946 61 std::string s; 62 s.append({"abc", 1}); 63 assert(s.size() == 1); 64 assert(s == "a"); 65 } 66 #endif 67 68 return true; 69 } 70 71 int main(int, char**) 72 { 73 test(); 74 #if TEST_STD_VER > 17 75 static_assert(test()); 76 #endif 77 78 return 0; 79 } 80