next.pass.cpp revision e9ef988b080912ae7f08c21ca953d783d4bf5ff0 
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// LWG #2353 relaxed the requirement on next from ForwardIterator to InputIterator
16
17#include <iterator>
18#include <cassert>
19
20#include "test_iterators.h"
21
22template <class It>
23void
24test(It i, typename std::iterator_traits<It>::difference_type n, It x)
25{
26    assert(std::next(i, n) == x);
27}
28
29template <class It>
30void
31test(It i, It x)
32{
33    assert(std::next(i) == x);
34}
35
36int main()
37{
38    const char* s = "1234567890";
39    test(input_iterator<const char*>(s), 10, input_iterator<const char*>(s+10));
40    test(forward_iterator<const char*>(s), 10, forward_iterator<const char*>(s+10));
41    test(bidirectional_iterator<const char*>(s), 10, bidirectional_iterator<const char*>(s+10));
42    test(random_access_iterator<const char*>(s), 10, random_access_iterator<const char*>(s+10));
43    test(s, 10, s+10);
44
45    test(input_iterator<const char*>(s), input_iterator<const char*>(s+1));
46    test(forward_iterator<const char*>(s), forward_iterator<const char*>(s+1));
47    test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+1));
48    test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1));
49    test(s, s+1);
50}
51