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// <string>
11
12// const charT& back() const;
13//       charT& back();
14
15#ifdef _LIBCPP_DEBUG
16#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
17#endif
18
19#include <string>
20#include <cassert>
21
22#include "min_allocator.h"
23
24template <class S>
25void
26test(S s)
27{
28    const S& cs = s;
29    assert(&cs.back() == &cs[cs.size()-1]);
30    assert(&s.back() == &s[cs.size()-1]);
31    s.back() = typename S::value_type('z');
32    assert(s.back() == typename S::value_type('z'));
33}
34
35int main()
36{
37    {
38    typedef std::string S;
39    test(S("1"));
40    test(S("1234567890123456789012345678901234567890"));
41    }
42#if __cplusplus >= 201103L
43    {
44    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
45    test(S("1"));
46    test(S("1234567890123456789012345678901234567890"));
47    }
48#endif
49#ifdef _LIBCPP_DEBUG
50    {
51        std::string s;
52        char c = s.back();
53        assert(false);
54    }
55#endif
56}
57