xref: /llvm-project/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp (revision 6e1dcc9335116f650d68cdbed12bbb34a99b2d9b) 
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>
11 
12 // constexpr bool starts_with(charT x) const noexcept;
13 
14 #include <string>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 template <class S>
test_string()20 constexpr void test_string() {
21   S s1{};
22   S s2{"abcde", 5};
23 
24   ASSERT_NOEXCEPT(s1.starts_with('e'));
25 
26   assert(!s1.starts_with('a'));
27   assert(!s1.starts_with('x'));
28   assert(s2.starts_with('a'));
29   assert(!s2.starts_with('x'));
30 }
31 
test()32 constexpr bool test() {
33   test_string<std::string>();
34 
35   return true;
36 }
37 
main(int,char **)38 int main(int, char**) {
39   test();
40   static_assert(test());
41 
42   return 0;
43 }
44