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 #include "asan_testing.h"
19
20 template <class S>
test(S s,S expected)21 TEST_CONSTEXPR_CXX20 void test(S s, S expected) {
22 s.pop_back();
23 LIBCPP_ASSERT(s.__invariants());
24 assert(s[s.size()] == typename S::value_type());
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("abcde"), S("abcd"));
32 test(S("abcdefghij"), S("abcdefghi"));
33 test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrs"));
34 test(S("abcdefghijklmnopqrstabcdefghijklmnopqrstabcdefghijklmnopqrstabcdefghijklmnopqrst"),
35 S("abcdefghijklmnopqrstabcdefghijklmnopqrstabcdefghijklmnopqrstabcdefghijklmnopqrs"));
36 }
37
test()38 TEST_CONSTEXPR_CXX20 bool test() {
39 test_string<std::string>();
40 #if TEST_STD_VER >= 11
41 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
42 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
43 #endif
44
45 return true;
46 }
47
main(int,char **)48 int main(int, char**) {
49 test();
50 #if TEST_STD_VER > 17
51 static_assert(test());
52 #endif
53
54 return 0;
55 }
56