difference_type.pass.cpp revision ba1920fe4b98e61fe47b432689c98b999f5139e3 
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// <iterator>
11
12// reverse_iterator
13
14// requires RandomAccessIterator<Iter>
15//   reverse_iterator& operator-=(difference_type n);
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, It x)
25{
26    std::reverse_iterator<It> r(i);
27    std::reverse_iterator<It>& rr = r -= n;
28    assert(r.base() == x);
29    assert(&rr == &r);
30}
31
32int main()
33{
34    const char* s = "1234567890";
35    test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
36    test(s+5, 5, s+10);
37}
38