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 // template <InputIterator Iter>
13 //   Iter next(Iter x, Iter::difference_type n = 1);
14 
15 #include <iterator>
16 #include <cassert>
17 
18 #include "test_iterators.h"
19 
20 template <class It>
21 void
22 test(It i, typename std::iterator_traits<It>::difference_type n, It x)
23 {
24     assert(std::next(i, n) == x);
25 }
26 
27 template <class It>
28 void
29 test(It i, It x)
30 {
31     assert(std::next(i) == x);
32 }
33 
34 int main()
35 {
36     const char* s = "1234567890";
37     test(forward_iterator<const char*>(s), 10, forward_iterator<const char*>(s+10));
38     test(bidirectional_iterator<const char*>(s), 10, bidirectional_iterator<const char*>(s+10));
39     test(random_access_iterator<const char*>(s), 10, random_access_iterator<const char*>(s+10));
40     test(s, 10, s+10);
41 
42     test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+1));
43     test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+1));
44     test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1));
45     test(s, s+1);
46 }
47