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#include "asan_testing.h"
21#include "operator_hijacker.h"
22
23template <class S>
24TEST_CONSTEXPR_CXX20 void test(S s1, S s2) {
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 LIBCPP_ASSERT(is_string_asan_correct(s1));
33 LIBCPP_ASSERT(is_string_asan_correct(s2));
34}
35
36template <class S>
37TEST_CONSTEXPR_CXX20 void test_string() {
38 test(S(""), S(""));
39 test(S(""), S("12345"));
40 test(S(""), S("1234567890"));
41 test(S(""), S("12345678901234567890"));
42 test(S("abcde"), S(""));
43 test(S("abcde"), S("12345"));
44 test(S("abcde"), S("1234567890"));
45 test(S("abcde"), S("12345678901234567890"));
46 test(S("abcdefghij"), S(""));
47 test(S("abcdefghij"), S("12345"));
48 test(S("abcdefghij"), S("1234567890"));
49 test(S("abcdefghij"), S("12345678901234567890"));
50 test(S("abcdefghijklmnopqrst"), S(""));
51 test(S("abcdefghijklmnopqrst"), S("12345"));
52 test(S("abcdefghijklmnopqrst"), S("1234567890"));
53 test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
54 test(S("abcdefghijklmnopqrstabcdefghijklmnopqrst"), S(""));
55 test(S("abcdefghijklmnopqrstabcdefghijklmnopqrst"), S("12345"));
56 test(S("abcdefghijklmnopqrstabcdefghijklmnopqrst"), S("1234567890"));
57 test(S("abcdefghijklmnopqrstabcdefghijklmnopqrst"), S("12345678901234567890"));
58 test(S("abcdefghijklmnopqrstabcdefghijklmnopqrst"), S("12345678901234567890abcdefghijklmnopqrst"));
59}
60
61TEST_CONSTEXPR_CXX20 bool test() {
62 test_string<std::string>();
63#if TEST_STD_VER >= 11
64 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
65 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
66 test_string<std::basic_string<char, std::char_traits<char>, operator_hijacker_allocator<char>>>();
67#endif
68
69 return true;
70}
71
72int main(int, char**) {
73 test();
74#if TEST_STD_VER > 17
75 static_assert(test());
76#endif
77
78 return 0;
79}
80

source code of libcxx/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp