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 // UNSUPPORTED: c++03
10
11 // <string>
12
13 // basic_string<charT,traits,Allocator>&
14 // operator=(basic_string<charT,traits,Allocator>&& str); // constexpr since C++20
15
16 #include <string>
17 #include <cassert>
18
19 #include "test_macros.h"
20 #include "test_allocator.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 s0 = s2;
28 s1 = std::move(s2);
29 LIBCPP_ASSERT(s1.__invariants());
30 LIBCPP_ASSERT(s2.__invariants());
31 assert(s1 == s0);
32 assert(s1.capacity() >= s1.size());
33 }
34
test()35 TEST_CONSTEXPR_CXX20 bool test() {
36 {
37 typedef std::string S;
38 test(S(), S());
39 test(S("1"), S());
40 test(S(), S("1"));
41 test(S("1"), S("2"));
42 test(S("1"), S("2"));
43
44 test(S(),
45 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
46 test(S("123456789"),
47 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
48 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
49 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
50 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
51 "1234567890123456789012345678901234567890123456789012345678901234567890"),
52 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
53 }
54 {
55 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
56 test(S(), S());
57 test(S("1"), S());
58 test(S(), S("1"));
59 test(S("1"), S("2"));
60 test(S("1"), S("2"));
61
62 test(S(),
63 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
64 test(S("123456789"),
65 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
66 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
67 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
68 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
69 "1234567890123456789012345678901234567890123456789012345678901234567890"),
70 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
71 }
72
73 return true;
74 }
75
main(int,char **)76 int main(int, char**)
77 {
78 test();
79 #if TEST_STD_VER > 17
80 static_assert(test());
81 #endif
82
83 return 0;
84 }
85