1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <iterator>
// template<class Iter>
// struct iterator_traits
// {
// typedef typename Iter::difference_type difference_type;
// typedef typename Iter::value_type value_type;
// typedef typename Iter::pointer pointer;
// typedef typename Iter::reference reference;
// typedef typename Iter::iterator_category iterator_category;
// };
#include <iterator>
#include <type_traits>
struct A {};
struct test_iterator
{
typedef int difference_type;
typedef A value_type;
typedef A* pointer;
typedef A& reference;
typedef std::forward_iterator_tag iterator_category;
};
int main()
{
typedef std::iterator_traits<test_iterator> It;
static_assert((std::is_same<It::difference_type, int>::value), "");
static_assert((std::is_same<It::value_type, A>::value), "");
static_assert((std::is_same<It::pointer, A*>::value), "");
static_assert((std::is_same<It::iterator_category, std::forward_iterator_tag>::value), "");
}
|
