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 // <string_view>
10 
11 // constexpr basic_string_view () noexcept;
12 
13 #include <string_view>
14 #include <cassert>
15 
16 #include "test_macros.h"
17 
18 template<typename T>
19 void test () {
20 #if TEST_STD_VER > 11
21     {
22     ASSERT_NOEXCEPT(T());
23 
24     constexpr T sv1;
25     static_assert ( sv1.size() == 0, "" );
26     static_assert ( sv1.empty(), "");
27     }
28 #endif
29 
30     {
31     T sv1;
32     assert ( sv1.size() == 0 );
33     assert ( sv1.empty());
34     }
35 }
36 
37 int main(int, char**) {
38     test<std::string_view> ();
39     test<std::u16string_view> ();
40 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
41     test<std::u8string_view> ();
42 #endif
43     test<std::u32string_view> ();
44 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
45     test<std::wstring_view> ();
46 #endif
47 
48   return 0;
49 }
50