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 // constexpr const _CharT& operator[](size_type _pos) const;
13 
14 #include <string_view>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 template <typename CharT>
20 void test ( const CharT *s, size_t len ) {
21     std::basic_string_view<CharT> sv ( s, len );
22     assert ( sv.length() == len );
23     for ( size_t i = 0; i < len; ++i ) {
24         assert ( sv[i] == s[i] );
25         assert ( &sv[i] == s + i );
26         }
27     }
28 
29 int main(int, char**) {
30     test ( "ABCDE", 5 );
31     test ( "a", 1 );
32 
33     test ( L"ABCDE", 5 );
34     test ( L"a", 1 );
35 
36 #if TEST_STD_VER >= 11
37     test ( u"ABCDE", 5 );
38     test ( u"a", 1 );
39 
40     test ( U"ABCDE", 5 );
41     test ( U"a", 1 );
42 #endif
43 
44 #if TEST_STD_VER > 11
45     {
46     constexpr std::basic_string_view<char> sv ( "ABC", 2 );
47     static_assert ( sv.length() ==  2,  "" );
48     static_assert ( sv[0]  == 'A', "" );
49     static_assert ( sv[1]  == 'B', "" );
50     }
51 #endif
52 
53   return 0;
54 }
55