1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 
11 // <string_view>
12 
13 // constexpr basic_string_view () noexcept;
14 
15 #include <experimental/string_view>
16 #include <cassert>
17 
18 template<typename T>
test()19 void test () {
20 #if _LIBCPP_STD_VER > 11
21     {
22     constexpr T sv1;
23     static_assert ( sv1.size() == 0, "" );
24     static_assert ( sv1.empty(), "");
25     }
26 #endif
27 
28     {
29     T sv1;
30     assert ( sv1.size() == 0 );
31     assert ( sv1.empty());
32     }
33 }
34 
main()35 int main () {
36     typedef std::experimental::string_view    string_view;
37     typedef std::experimental::u16string_view u16string_view;
38     typedef std::experimental::u32string_view u32string_view;
39     typedef std::experimental::wstring_view   wstring_view;
40 
41     test<string_view> ();
42     test<u16string_view> ();
43     test<u32string_view> ();
44     test<wstring_view> ();
45 
46 }
47