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: !stdlib=libc++ && (c++03 || c++11 || c++14)
10 
11 // <string_view>
12 
13 // constexpr basic_string_view () noexcept;
14 
15 #include <string_view>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 template<typename T>
21 void test () {
22 #if TEST_STD_VER > 11
23     {
24     ASSERT_NOEXCEPT(T());
25 
26     constexpr T sv1;
27     static_assert ( sv1.size() == 0, "" );
28     static_assert ( sv1.empty(), "");
29     }
30 #endif
31 
32     {
33     T sv1;
34     assert ( sv1.size() == 0 );
35     assert ( sv1.empty());
36     }
37 }
38 
39 int main(int, char**) {
40     test<std::string_view> ();
41     test<std::u16string_view> ();
42 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
43     test<std::u8string_view> ();
44 #endif
45     test<std::u32string_view> ();
46 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
47     test<std::wstring_view> ();
48 #endif
49 
50   return 0;
51 }
52