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 // void push_back(charT c) // constexpr since C++20
12
13 #include <string>
14 #include <cassert>
15
16 #include "test_macros.h"
17 #include "min_allocator.h"
18
19 struct veryLarge
20 {
21 long long a;
22 char b;
23 };
24
25 template <class S>
26 TEST_CONSTEXPR_CXX20 void
test(S s,typename S::value_type c,S expected)27 test(S s, typename S::value_type c, S expected)
28 {
29 s.push_back(c);
30 LIBCPP_ASSERT(s.__invariants());
31 assert(s == expected);
32 }
33
test()34 TEST_CONSTEXPR_CXX20 bool test() {
35 {
36 typedef std::string S;
37 test(S(), 'a', S(1, 'a'));
38 test(S("12345"), 'a', S("12345a"));
39 test(S("12345678901234567890"), 'a', S("12345678901234567890a"));
40 }
41 #if TEST_STD_VER >= 11
42 {
43 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
44 test(S(), 'a', S(1, 'a'));
45 test(S("12345"), 'a', S("12345a"));
46 test(S("12345678901234567890"), 'a', S("12345678901234567890a"));
47 }
48 #endif
49
50 {
51 // https://llvm.org/PR31454
52 std::basic_string<veryLarge> s;
53 veryLarge vl = {};
54 s.push_back(vl);
55 s.push_back(vl);
56 s.push_back(vl);
57 }
58
59 return true;
60 }
61
main(int,char **)62 int main(int, char**)
63 {
64 test();
65 #if TEST_STD_VER > 17
66 static_assert(test());
67 #endif
68
69 return 0;
70 }
71