difference_type.pass.cpp revision bc8d3f97eb5c958007f2713238472e0c1c8fe02c 
1//===----------------------------------------------------------------------===//
2//
3// ��������������������The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <iterator>
11
12// reverse_iterator
13
14// requires RandomAccessIterator<Iter>
15//   unspecified operator[](difference_type n) const;
16
17#include <iterator>
18#include <cassert>
19
20#include "../../../../iterators.h"
21
22template <class It>
23void
24test(It i, typename std::iterator_traits<It>::difference_type n,
25     typename std::iterator_traits<It>::value_type x)
26{
27    typedef typename std::iterator_traits<It>::value_type value_type;
28    const std::reverse_iterator<It> r(i);
29    value_type rr = r[n];
30    assert(rr == x);
31}
32
33int main()
34{
35    const char* s = "1234567890";
36    test(random_access_iterator<const char*>(s+5), 4, '1');
37    test(s+5, 4, '1');
38}
39