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