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(charT x) const noexcept;
14
15 #include <string_view>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "constexpr_char_traits.h"
20
main(int,char **)21 int main(int, char**)
22 {
23 {
24 typedef std::string_view SV;
25 SV sv1 {};
26 SV sv2 { "abcde", 5 };
27
28 ASSERT_NOEXCEPT(sv1.starts_with('e'));
29
30 assert (!sv1.starts_with('a'));
31 assert (!sv1.starts_with('x'));
32 assert ( sv2.starts_with('a'));
33 assert (!sv2.starts_with('x'));
34 }
35
36 #if TEST_STD_VER > 11
37 {
38 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
39 constexpr SV sv1 {};
40 constexpr SV sv2 { "abcde", 5 };
41 static_assert (!sv1.starts_with('a'), "" );
42 static_assert (!sv1.starts_with('x'), "" );
43 static_assert ( sv2.starts_with('a'), "" );
44 static_assert (!sv2.starts_with('x'), "" );
45 }
46 #endif
47
48 return 0;
49 }
50