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 // operator=(const basic_string<charT,traits,Allocator>& 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
test(S s1,const S & s2)22 test(S s1, const S& s2)
23 {
24 s1 = s2;
25 LIBCPP_ASSERT(s1.__invariants());
26 assert(s1 == s2);
27 assert(s1.capacity() >= s1.size());
28 }
29
test()30 TEST_CONSTEXPR_CXX20 bool test() {
31 {
32 typedef std::string S;
33 test(S(), S());
34 test(S("1"), S());
35 test(S(), S("1"));
36 test(S("1"), S("2"));
37 test(S("1"), S("2"));
38
39 test(S(),
40 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
41 test(S("123456789"),
42 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
43 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
44 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
45 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
46 "1234567890123456789012345678901234567890123456789012345678901234567890"),
47 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
48 }
49 #if TEST_STD_VER >= 11
50 {
51 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
52 test(S(), S());
53 test(S("1"), S());
54 test(S(), S("1"));
55 test(S("1"), S("2"));
56 test(S("1"), S("2"));
57
58 test(S(),
59 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
60 test(S("123456789"),
61 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
62 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
63 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
64 test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
65 "1234567890123456789012345678901234567890123456789012345678901234567890"),
66 S("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"));
67 }
68 #endif
69
70 #if TEST_STD_VER > 3
71 { // LWG 2946
72 std::string s;
73 s = {"abc", 1};
74 assert(s.size() == 1);
75 assert(s == "a");
76 }
77 #endif
78
79 return true;
80 }
81
main(int,char **)82 int main(int, char**)
83 {
84 test();
85 #if TEST_STD_VER > 17
86 static_assert(test());
87 #endif
88
89 return 0;
90 }
91