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 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10 
11 // <string_view>
12 
13 //   constexpr bool contains(const CharT *x) const;
14 
15 #include <string_view>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 constexpr bool test()
21 {
22     using SV = std::string_view;
23 
24     const char* s = "abcde";
25     SV sv0;
26     SV sv1 {s + 4, 1};
27     SV sv3 {s + 2, 3};
28     SV svNot {"xyz", 3};
29 
30     assert( sv0.contains(""));
31     assert(!sv0.contains("e"));
32 
33     assert( sv1.contains(""));
34     assert(!sv1.contains("d"));
35     assert( sv1.contains("e"));
36     assert(!sv1.contains("de"));
37     assert(!sv1.contains("cd"));
38     assert(!sv1.contains("cde"));
39     assert(!sv1.contains("bcde"));
40     assert(!sv1.contains("abcde"));
41     assert(!sv1.contains("xyz"));
42 
43     assert( sv3.contains(""));
44     assert( sv3.contains("d"));
45     assert( sv3.contains("e"));
46     assert( sv3.contains("de"));
47     assert( sv3.contains("cd"));
48     assert(!sv3.contains("ce"));
49     assert( sv3.contains("cde"));
50     assert(!sv3.contains("edc"));
51     assert(!sv3.contains("bcde"));
52     assert(!sv3.contains("abcde"));
53     assert(!sv3.contains("xyz"));
54 
55     assert( svNot.contains(""));
56     assert(!svNot.contains("d"));
57     assert(!svNot.contains("e"));
58     assert(!svNot.contains("de"));
59     assert(!svNot.contains("cd"));
60     assert(!svNot.contains("cde"));
61     assert(!svNot.contains("bcde"));
62     assert(!svNot.contains("abcde"));
63     assert( svNot.contains("xyz"));
64     assert(!svNot.contains("zyx"));
65 
66     return true;
67 }
68 
69 int main(int, char**)
70 {
71     test();
72     static_assert(test());
73 
74     return 0;
75 }
76