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 #include "asan_testing.h"
20
21 template <class S>
test(S s,S str,S expected)22 TEST_CONSTEXPR_CXX20 void test(S s, S str, S expected) {
23 s += str;
24 LIBCPP_ASSERT(s.__invariants());
25 assert(s == expected);
26 LIBCPP_ASSERT(is_string_asan_correct(s));
27 }
28
29 template <class S>
test_string()30 TEST_CONSTEXPR_CXX20 void test_string() {
31 test(S(), S(), S());
32 test(S(), S("12345"), S("12345"));
33 test(S(), S("1234567890"), S("1234567890"));
34 test(S(), S("12345678901234567890"), S("12345678901234567890"));
35
36 test(S("12345"), S(), S("12345"));
37 test(S("12345"), S("12345"), S("1234512345"));
38 test(S("12345"), S("1234567890"), S("123451234567890"));
39 test(S("12345"), S("12345678901234567890"), S("1234512345678901234567890"));
40
41 test(S("1234567890"), S(), S("1234567890"));
42 test(S("1234567890"), S("12345"), S("123456789012345"));
43 test(S("1234567890"), S("1234567890"), S("12345678901234567890"));
44 test(S("1234567890"), S("12345678901234567890"), S("123456789012345678901234567890"));
45
46 test(S("12345678901234567890"), S(), S("12345678901234567890"));
47 test(S("12345678901234567890"), S("12345"), S("1234567890123456789012345"));
48 test(S("12345678901234567890"), S("1234567890"), S("123456789012345678901234567890"));
49 test(S("12345678901234567890"), S("12345678901234567890"), S("1234567890123456789012345678901234567890"));
50
51 // Starting from long string (no SSO)
52 test(S("1234567890123456789012345678901234567890"), S(), S("1234567890123456789012345678901234567890"));
53 test(S("1234567890123456789012345678901234567890"), S("12345"), S("123456789012345678901234567890123456789012345"));
54 test(S("1234567890123456789012345678901234567890"),
55 S("12345678901234567890"),
56 S("123456789012345678901234567890123456789012345678901234567890"));
57 test(S("1234567890123456789012345678901234567890"),
58 S("1234567890123456789012345678901234567890"),
59 S("12345678901234567890123456789012345678901234567890123456789012345678901234567890"));
60 }
61
test()62 TEST_CONSTEXPR_CXX20 bool test() {
63 test_string<std::string>();
64 #if TEST_STD_VER >= 11
65 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
66 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char> > >();
67 { // LWG 2946
68 std::string s;
69 s += {"abc", 1};
70 assert(s.size() == 1);
71 assert(s == "a");
72 LIBCPP_ASSERT(is_string_asan_correct(s));
73 }
74 #endif
75
76 return true;
77 }
78
main(int,char **)79 int main(int, char**) {
80 test();
81 #if TEST_STD_VER > 17
82 static_assert(test());
83 #endif
84
85 return 0;
86 }
87