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(charT x) const noexcept;
13
14 #include <string_view>
15 #include <cassert>
16
17 #include "test_macros.h"
18 #include "constexpr_char_traits.h"
19
main(int,char **)20 int main(int, char**)
21 {
22 {
23 typedef std::string_view SV;
24 SV sv1 {};
25 SV sv2 { "abcde", 5 };
26
27 ASSERT_NOEXCEPT(sv1.starts_with('e'));
28
29 assert (!sv1.starts_with('a'));
30 assert (!sv1.starts_with('x'));
31 assert ( sv2.starts_with('a'));
32 assert (!sv2.starts_with('x'));
33 }
34
35 #if TEST_STD_VER > 11
36 {
37 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
38 constexpr SV sv1 {};
39 constexpr SV sv2 { "abcde", 5 };
40 static_assert (!sv1.starts_with('a'), "" );
41 static_assert (!sv1.starts_with('x'), "" );
42 static_assert ( sv2.starts_with('a'), "" );
43 static_assert (!sv2.starts_with('x'), "" );
44 }
45 #endif
46
47 return 0;
48 }
49