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