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
9
10 // <string>
11
12 // constexpr bool starts_with(string_view x) const noexcept;
13
14 #include <string>
15 #include <cassert>
16
17 #include "test_macros.h"
18
test()19 constexpr bool test() {
20 typedef std::string S;
21 typedef std::string_view SV;
22 const char *s = "abcde";
23
24 S s0;
25 S s1 { s, 1 };
26 S s2 { s, 2 };
27 // S s3 { s, 3 };
28 // S s4 { s, 4 };
29 // S s5 { s, 5 };
30 S sNot { "def", 3 };
31
32 SV sv0;
33 SV sv1 { s, 1 };
34 SV sv2 { s, 2 };
35 SV sv3 { s, 3 };
36 SV sv4 { s, 4 };
37 SV sv5 { s, 5 };
38 SV svNot {"def", 3 };
39
40 ASSERT_NOEXCEPT(s0.starts_with(sv0));
41
42 assert ( s0.starts_with(sv0));
43 assert (!s0.starts_with(sv1));
44
45 assert ( s1.starts_with(sv0));
46 assert ( s1.starts_with(sv1));
47 assert (!s1.starts_with(sv2));
48 assert (!s1.starts_with(sv3));
49 assert (!s1.starts_with(sv4));
50 assert (!s1.starts_with(sv5));
51 assert (!s1.starts_with(svNot));
52
53 assert ( s2.starts_with(sv0));
54 assert ( s2.starts_with(sv1));
55 assert ( s2.starts_with(sv2));
56 assert (!s2.starts_with(sv3));
57 assert (!s2.starts_with(sv4));
58 assert (!s2.starts_with(sv5));
59 assert (!s2.starts_with(svNot));
60
61 assert ( sNot.starts_with(sv0));
62 assert (!sNot.starts_with(sv1));
63 assert (!sNot.starts_with(sv2));
64 assert (!sNot.starts_with(sv3));
65 assert (!sNot.starts_with(sv4));
66 assert (!sNot.starts_with(sv5));
67 assert ( sNot.starts_with(svNot));
68
69 return true;
70 }
71
main(int,char **)72 int main(int, char**)
73 {
74 test();
75 static_assert(test());
76
77 return 0;
78 }
79