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 // bool empty() const noexcept; // 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(const S& s)
24 {
25     ASSERT_NOEXCEPT(s.empty());
26     assert(s.empty() == (s.size() == 0));
27 }
28 
29 TEST_CONSTEXPR_CXX20 bool test() {
30   {
31     typedef std::string S;
32     test(S());
33     test(S("123"));
34     test(S("12345678901234567890123456789012345678901234567890"));
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());
40     test(S("123"));
41     test(S("12345678901234567890123456789012345678901234567890"));
42   }
43 #endif
44 
45   return true;
46 }
47 
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