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
10
11// <string_view>
12
13// constexpr bool starts_with(string_view x) const noexcept;
14
15#include <string_view>
16#include <cassert>
17
18#include "test_macros.h"
19#include "constexpr_char_traits.h"
20
21int main(int, char**) {
22 {
23 typedef std::string_view SV;
24 const char* s = "abcde";
25 SV sv0{};
26 SV sv1{s, 1};
27 SV sv2{s, 2};
28 SV sv3{s, 3};
29 SV sv4{s, 4};
30 SV sv5{s, 5};
31 SV svNot{"def", 3};
32
33 ASSERT_NOEXCEPT(sv0.starts_with(sv0));
34
35 assert(sv0.starts_with(sv0));
36 assert(!sv0.starts_with(sv1));
37
38 assert(sv1.starts_with(sv0));
39 assert(sv1.starts_with(sv1));
40 assert(!sv1.starts_with(sv2));
41 assert(!sv1.starts_with(sv3));
42 assert(!sv1.starts_with(sv4));
43 assert(!sv1.starts_with(sv5));
44 assert(!sv1.starts_with(svNot));
45
46 assert(sv2.starts_with(sv0));
47 assert(sv2.starts_with(sv1));
48 assert(sv2.starts_with(sv2));
49 assert(!sv2.starts_with(sv3));
50 assert(!sv2.starts_with(sv4));
51 assert(!sv2.starts_with(sv5));
52 assert(!sv2.starts_with(svNot));
53
54 assert(svNot.starts_with(sv0));
55 assert(!svNot.starts_with(sv1));
56 assert(!svNot.starts_with(sv2));
57 assert(!svNot.starts_with(sv3));
58 assert(!svNot.starts_with(sv4));
59 assert(!svNot.starts_with(sv5));
60 assert(svNot.starts_with(svNot));
61 }
62
63#if TEST_STD_VER > 11
64 {
65 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
66 constexpr const char* s = "abcde";
67 constexpr SV sv0{};
68 constexpr SV sv1{s, 1};
69 constexpr SV sv2{s, 2};
70 constexpr SV sv3{s, 3};
71 constexpr SV sv4{s, 4};
72 constexpr SV sv5{s, 5};
73 constexpr SV svNot{"def", 3};
74
75 static_assert(sv0.starts_with(sv0), "");
76 static_assert(!sv0.starts_with(sv1), "");
77
78 static_assert(sv1.starts_with(sv0), "");
79 static_assert(sv1.starts_with(sv1), "");
80 static_assert(!sv1.starts_with(sv2), "");
81 static_assert(!sv1.starts_with(sv3), "");
82 static_assert(!sv1.starts_with(sv4), "");
83 static_assert(!sv1.starts_with(sv5), "");
84 static_assert(!sv1.starts_with(svNot), "");
85
86 static_assert(sv2.starts_with(sv0), "");
87 static_assert(sv2.starts_with(sv1), "");
88 static_assert(sv2.starts_with(sv2), "");
89 static_assert(!sv2.starts_with(sv3), "");
90 static_assert(!sv2.starts_with(sv4), "");
91 static_assert(!sv2.starts_with(sv5), "");
92 static_assert(!sv2.starts_with(svNot), "");
93
94 static_assert(svNot.starts_with(sv0), "");
95 static_assert(!svNot.starts_with(sv1), "");
96 static_assert(!svNot.starts_with(sv2), "");
97 static_assert(!svNot.starts_with(sv3), "");
98 static_assert(!svNot.starts_with(sv4), "");
99 static_assert(!svNot.starts_with(sv5), "");
100 static_assert(svNot.starts_with(svNot), "");
101 }
102#endif
103
104 return 0;
105}
106

source code of libcxx/test/std/strings/string.view/string.view.template/starts_with.string_view.pass.cpp