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& operator=(const basic_string_view &) noexcept = default;
14 
15 #include <string_view>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 template<typename T>
21 #if TEST_STD_VER > 11
22 constexpr
23 #endif
test(T sv0)24 bool test (T sv0)
25     {
26     T sv1;
27     sv1 = sv0;
28 //  We can't just say "sv0 == sv1" here because string_view::compare
29 //  isn't constexpr until C++17, and we want to support back to C++14
30     return sv0.size() == sv1.size() && sv0.data() == sv1.data();
31     }
32 
main()33 int main () {
34 
35     assert( test<std::string_view>    ( "1234"));
36 #ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
37     assert( test<std::u16string_view> (u"1234"));
38     assert( test<std::u32string_view> (U"1234"));
39 #endif
40     assert( test<std::wstring_view>   (L"1234"));
41 
42 #if TEST_STD_VER > 11
43     static_assert( test<std::string_view>    ({ "abc", 3}), "");
44 #ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
45     static_assert( test<std::u16string_view> ({u"abc", 3}), "");
46     static_assert( test<std::u32string_view> ({U"abc", 3}), "");
47 #endif
48     static_assert( test<std::wstring_view>   ({L"abc", 3}), "");
49 #endif
50 }
51