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