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 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
9 
10 // <string>
11 
12 //   constexpr bool contains(charT x) const noexcept;
13 
14 #include <string>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 bool test()
20 {
21     using S = std::string;
22 
23     S s1 {};
24     S s2 {"abcde", 5};
25 
26     ASSERT_NOEXCEPT(s1.contains('e'));
27 
28     assert(!s1.contains('c'));
29     assert(!s1.contains('e'));
30     assert(!s1.contains('x'));
31     assert( s2.contains('c'));
32     assert( s2.contains('e'));
33     assert(!s2.contains('x'));
34 
35     return true;
36 }
37 
38 int main(int, char**)
39 {
40   test();
41 #if TEST_STD_VER > 17
42   // static_assert(test());
43 #endif
44 
45   return 0;
46 }
47