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 // append(const basic_string<charT,traits>& 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 s,S str,S expected)22 test(S s, S str, S expected)
23 {
24 s.append(str);
25 LIBCPP_ASSERT(s.__invariants());
26 assert(s == expected);
27 }
28
test()29 TEST_CONSTEXPR_CXX20 bool test() {
30 {
31 typedef std::string S;
32 test(S(), S(), S());
33 test(S(), S("12345"), S("12345"));
34 test(S(), S("1234567890"), S("1234567890"));
35 test(S(), S("12345678901234567890"), S("12345678901234567890"));
36
37 test(S("12345"), S(), S("12345"));
38 test(S("12345"), S("12345"), S("1234512345"));
39 test(S("12345"), S("1234567890"), S("123451234567890"));
40 test(S("12345"), S("12345678901234567890"), S("1234512345678901234567890"));
41
42 test(S("1234567890"), S(), S("1234567890"));
43 test(S("1234567890"), S("12345"), S("123456789012345"));
44 test(S("1234567890"), S("1234567890"), S("12345678901234567890"));
45 test(S("1234567890"), S("12345678901234567890"), S("123456789012345678901234567890"));
46
47 test(S("12345678901234567890"), S(), S("12345678901234567890"));
48 test(S("12345678901234567890"), S("12345"), S("1234567890123456789012345"));
49 test(S("12345678901234567890"), S("1234567890"), S("123456789012345678901234567890"));
50 test(S("12345678901234567890"), S("12345678901234567890"),
51 S("1234567890123456789012345678901234567890"));
52 }
53 #if TEST_STD_VER >= 11
54 {
55 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
56 test(S(), S(), S());
57 test(S(), S("12345"), S("12345"));
58 test(S(), S("1234567890"), S("1234567890"));
59 test(S(), S("12345678901234567890"), S("12345678901234567890"));
60
61 test(S("12345"), S(), S("12345"));
62 test(S("12345"), S("12345"), S("1234512345"));
63 test(S("12345"), S("1234567890"), S("123451234567890"));
64 test(S("12345"), S("12345678901234567890"), S("1234512345678901234567890"));
65
66 test(S("1234567890"), S(), S("1234567890"));
67 test(S("1234567890"), S("12345"), S("123456789012345"));
68 test(S("1234567890"), S("1234567890"), S("12345678901234567890"));
69 test(S("1234567890"), S("12345678901234567890"), S("123456789012345678901234567890"));
70
71 test(S("12345678901234567890"), S(), S("12345678901234567890"));
72 test(S("12345678901234567890"), S("12345"), S("1234567890123456789012345"));
73 test(S("12345678901234567890"), S("1234567890"), S("123456789012345678901234567890"));
74 test(S("12345678901234567890"), S("12345678901234567890"),
75 S("1234567890123456789012345678901234567890"));
76 }
77 #endif
78
79 #if TEST_STD_VER > 3
80 { // LWG 2946
81 std::string s;
82 s.append({"abc", 1});
83 assert(s.size() == 1);
84 assert(s == "a");
85 }
86 #endif
87
88 return true;
89 }
90
main(int,char **)91 int main(int, char**)
92 {
93 test();
94 #if TEST_STD_VER > 17
95 static_assert(test());
96 #endif
97
98 return 0;
99 }
100