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 
10 // <string_view>
11 
12 // template<class Allocator>
13 // basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
14 
15 
16 #include <string_view>
17 #include <string>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 struct dummy_char_traits : public std::char_traits<char> {};
23 
24 template<typename CharT, typename Traits>
25 void test ( const std::basic_string<CharT, Traits> &str ) {
26     typedef std::basic_string_view<CharT, Traits> SV;
27     ASSERT_NOEXCEPT(SV(str));
28 
29     SV sv1 ( str );
30     assert ( sv1.size() == str.size());
31     assert ( sv1.data() == str.data());
32 }
33 
34 int main(int, char**) {
35 
36     test ( std::string("QBCDE") );
37     test ( std::string("") );
38     test ( std::string() );
39 
40     test ( std::wstring(L"QBCDE") );
41     test ( std::wstring(L"") );
42     test ( std::wstring() );
43 
44 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
45     test ( std::u8string{u8"QBCDE"} );
46     test ( std::u8string{u8""} );
47     test ( std::u8string{} );
48 #endif
49 
50 #if TEST_STD_VER >= 11
51     test ( std::u16string{u"QBCDE"} );
52     test ( std::u16string{u""} );
53     test ( std::u16string{} );
54 
55     test ( std::u32string{U"QBCDE"} );
56     test ( std::u32string{U""} );
57     test ( std::u32string{} );
58 #endif
59 
60     test ( std::basic_string<char, dummy_char_traits>("QBCDE") );
61     test ( std::basic_string<char, dummy_char_traits>("") );
62     test ( std::basic_string<char, dummy_char_traits>() );
63 
64 
65   return 0;
66 }
67