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 // void swap(basic_string& s); // constexpr since C++20 12 13 #include <string> 14 #include <stdexcept> 15 #include <algorithm> 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 s1, S s2) 24 { 25 S s1_ = s1; 26 S s2_ = s2; 27 s1.swap(s2); 28 LIBCPP_ASSERT(s1.__invariants()); 29 LIBCPP_ASSERT(s2.__invariants()); 30 assert(s1 == s2_); 31 assert(s2 == s1_); 32 } 33 34 TEST_CONSTEXPR_CXX20 bool test() { 35 { 36 typedef std::string S; 37 test(S(""), S("")); 38 test(S(""), S("12345")); 39 test(S(""), S("1234567890")); 40 test(S(""), S("12345678901234567890")); 41 test(S("abcde"), S("")); 42 test(S("abcde"), S("12345")); 43 test(S("abcde"), S("1234567890")); 44 test(S("abcde"), S("12345678901234567890")); 45 test(S("abcdefghij"), S("")); 46 test(S("abcdefghij"), S("12345")); 47 test(S("abcdefghij"), S("1234567890")); 48 test(S("abcdefghij"), S("12345678901234567890")); 49 test(S("abcdefghijklmnopqrst"), S("")); 50 test(S("abcdefghijklmnopqrst"), S("12345")); 51 test(S("abcdefghijklmnopqrst"), S("1234567890")); 52 test(S("abcdefghijklmnopqrst"), S("12345678901234567890")); 53 } 54 #if TEST_STD_VER >= 11 55 { 56 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S; 57 test(S(""), S("")); 58 test(S(""), S("12345")); 59 test(S(""), S("1234567890")); 60 test(S(""), S("12345678901234567890")); 61 test(S("abcde"), S("")); 62 test(S("abcde"), S("12345")); 63 test(S("abcde"), S("1234567890")); 64 test(S("abcde"), S("12345678901234567890")); 65 test(S("abcdefghij"), S("")); 66 test(S("abcdefghij"), S("12345")); 67 test(S("abcdefghij"), S("1234567890")); 68 test(S("abcdefghij"), S("12345678901234567890")); 69 test(S("abcdefghijklmnopqrst"), S("")); 70 test(S("abcdefghijklmnopqrst"), S("12345")); 71 test(S("abcdefghijklmnopqrst"), S("1234567890")); 72 test(S("abcdefghijklmnopqrst"), S("12345678901234567890")); 73 } 74 #endif 75 76 return true; 77 } 78 79 int main(int, char**) 80 { 81 test(); 82 #if TEST_STD_VER > 17 83 static_assert(test()); 84 #endif 85 86 return 0; 87 } 88