1// (C) Copyright Jens Maurer 2001.
2// Distributed under the Boost Software License, Version 1.0. (See
3// accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5//
6// Revision History:
7
8// 15 Nov 2001 Jens Maurer
9// created.
10
11// See http://www.boost.org/libs/utility/iterator_adaptors.htm for documentation.
12
13#ifndef BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
14#define BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
15
16#include <boost/iterator/iterator_facade.hpp>
17#include <boost/ref.hpp>
18
19namespace boost {
20namespace iterators {
21
22template<class Generator>
23class generator_iterator
24 : public iterator_facade<
25 generator_iterator<Generator>
26 , typename Generator::result_type
27 , single_pass_traversal_tag
28 , typename Generator::result_type const&
29 >
30{
31 typedef iterator_facade<
32 generator_iterator<Generator>
33 , typename Generator::result_type
34 , single_pass_traversal_tag
35 , typename Generator::result_type const&
36 > super_t;
37
38 public:
39 generator_iterator() {}
40 generator_iterator(Generator* g) : m_g(g), m_value((*m_g)()) {}
41
42 void increment()
43 {
44 m_value = (*m_g)();
45 }
46
47 const typename Generator::result_type&
48 dereference() const
49 {
50 return m_value;
51 }
52
53 bool equal(generator_iterator const& y) const
54 {
55 return this->m_g == y.m_g && this->m_value == y.m_value;
56 }
57
58 private:
59 Generator* m_g;
60 typename Generator::result_type m_value;
61};
62
63template<class Generator>
64struct generator_iterator_generator
65{
66 typedef generator_iterator<Generator> type;
67};
68
69template <class Generator>
70inline generator_iterator<Generator>
71make_generator_iterator(Generator & gen)
72{
73 typedef generator_iterator<Generator> result_t;
74 return result_t(&gen);
75}
76
77} // namespace iterators
78
79using iterators::generator_iterator;
80using iterators::generator_iterator_generator;
81using iterators::make_generator_iterator;
82
83} // namespace boost
84
85#endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
86

source code of boost/libs/iterator/include/boost/generator_iterator.hpp