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 // template<class charT, class traits, class Allocator>
12 // void swap(basic_string<charT,traits,Allocator>& lhs,
13 // basic_string<charT,traits,Allocator>& rhs); // constexpr since C++20
14
15 #include <string>
16 #include <stdexcept>
17 #include <algorithm>
18 #include <cassert>
19
20 #include "test_macros.h"
21 #include "min_allocator.h"
22
23 template <class S>
24 TEST_CONSTEXPR_CXX20 void
test(S s1,S s2)25 test(S s1, S s2)
26 {
27 S s1_ = s1;
28 S s2_ = s2;
29 swap(s1, s2);
30 LIBCPP_ASSERT(s1.__invariants());
31 LIBCPP_ASSERT(s2.__invariants());
32 assert(s1 == s2_);
33 assert(s2 == s1_);
34 }
35
test()36 TEST_CONSTEXPR_CXX20 bool test() {
37 {
38 typedef std::string S;
39 test(S(""), S(""));
40 test(S(""), S("12345"));
41 test(S(""), S("1234567890"));
42 test(S(""), S("12345678901234567890"));
43 test(S("abcde"), S(""));
44 test(S("abcde"), S("12345"));
45 test(S("abcde"), S("1234567890"));
46 test(S("abcde"), S("12345678901234567890"));
47 test(S("abcdefghij"), S(""));
48 test(S("abcdefghij"), S("12345"));
49 test(S("abcdefghij"), S("1234567890"));
50 test(S("abcdefghij"), S("12345678901234567890"));
51 test(S("abcdefghijklmnopqrst"), S(""));
52 test(S("abcdefghijklmnopqrst"), S("12345"));
53 test(S("abcdefghijklmnopqrst"), S("1234567890"));
54 test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
55 }
56 #if TEST_STD_VER >= 11
57 {
58 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
59 test(S(""), S(""));
60 test(S(""), S("12345"));
61 test(S(""), S("1234567890"));
62 test(S(""), S("12345678901234567890"));
63 test(S("abcde"), S(""));
64 test(S("abcde"), S("12345"));
65 test(S("abcde"), S("1234567890"));
66 test(S("abcde"), S("12345678901234567890"));
67 test(S("abcdefghij"), S(""));
68 test(S("abcdefghij"), S("12345"));
69 test(S("abcdefghij"), S("1234567890"));
70 test(S("abcdefghij"), S("12345678901234567890"));
71 test(S("abcdefghijklmnopqrst"), S(""));
72 test(S("abcdefghijklmnopqrst"), S("12345"));
73 test(S("abcdefghijklmnopqrst"), S("1234567890"));
74 test(S("abcdefghijklmnopqrst"), S("12345678901234567890"));
75 }
76 #endif
77
78 return true;
79 }
80
main(int,char **)81 int main(int, char**)
82 {
83 test();
84 #if TEST_STD_VER > 17
85 static_assert(test());
86 #endif
87
88 return 0;
89 }
90