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
21int 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

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