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 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