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 // <string>
10 
11 // const_reference operator[](size_type pos) const;
12 //       reference operator[](size_type pos);
13 
14 #ifdef _LIBCPP_DEBUG
15 #define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
16 #endif
17 
18 #include <string>
19 #include <cassert>
20 
21 #include "min_allocator.h"
22 
23 int main(int, char**)
24 {
25     {
26     typedef std::string S;
27     S s("0123456789");
28     const S& cs = s;
29     for (S::size_type i = 0; i < cs.size(); ++i)
30     {
31         assert(s[i] == static_cast<char>('0' + i));
32         assert(cs[i] == s[i]);
33     }
34     assert(cs[cs.size()] == '\0');
35     const S s2 = S();
36     assert(s2[0] == '\0');
37     }
38 #if TEST_STD_VER >= 11
39     {
40     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
41     S s("0123456789");
42     const S& cs = s;
43     for (S::size_type i = 0; i < cs.size(); ++i)
44     {
45         assert(s[i] == static_cast<char>('0' + i));
46         assert(cs[i] == s[i]);
47     }
48     assert(cs[cs.size()] == '\0');
49     const S s2 = S();
50     assert(s2[0] == '\0');
51     }
52 #endif
53 #ifdef _LIBCPP_DEBUG
54     {
55         std::string s;
56         char c = s[0];
57         assert(c == '\0');
58         c = s[1];
59         assert(false);
60     }
61 #endif
62 
63   return 0;
64 }
65