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 // XFAIL: LIBCXX-AIX-FIXME
10 
11 // <string>
12 
13 // void pop_back(); // constexpr since C++20
14 
15 #include <string>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "min_allocator.h"
20 
21 template <class S>
22 TEST_CONSTEXPR_CXX20 void
23 test(S s, S expected)
24 {
25     s.pop_back();
26     LIBCPP_ASSERT(s.__invariants());
27     assert(s[s.size()] == typename S::value_type());
28     assert(s == expected);
29 }
30 
31 TEST_CONSTEXPR_CXX20 bool test() {
32   {
33     typedef std::string S;
34     test(S("abcde"), S("abcd"));
35     test(S("abcdefghij"), S("abcdefghi"));
36     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrs"));
37   }
38 #if TEST_STD_VER >= 11
39   {
40     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
41     test(S("abcde"), S("abcd"));
42     test(S("abcdefghij"), S("abcdefghi"));
43     test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrs"));
44   }
45 #endif
46 
47   return true;
48 }
49 
50 int main(int, char**)
51 {
52   test();
53 #if TEST_STD_VER > 17
54   static_assert(test());
55 #endif
56 
57   return 0;
58 }
59