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/Src/Dependencies/Boost/boost/generator_iterator.hpp

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 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 {
20
21template<class Generator>
22class generator_iterator
23  : public iterator_facade<
24        generator_iterator<Generator>
25      , typename Generator::result_type
26      , single_pass_traversal_tag
27      , typename Generator::result_type const&
28    >
29{
30    typedef iterator_facade<
31        generator_iterator<Generator>
32      , typename Generator::result_type
33      , single_pass_traversal_tag
34      , typename Generator::result_type const&
35    > super_t;
36    
37 public:
38    generator_iterator() {}
39    generator_iterator(Generator* g) : m_g(g), m_value((*m_g)()) {}
40
41    void increment()
42    {
43        m_value = (*m_g)();
44    }
45
46    const typename Generator::result_type&
47    dereference() const
48    {
49        return m_value;
50    }
51
52    bool equal(generator_iterator const& y) const
53    {
54        return this->m_g == y.m_g && this->m_value == y.m_value;
55    }
56
57 private:
58    Generator* m_g;
59    typename Generator::result_type m_value;
60};
61
62template<class Generator>
63struct generator_iterator_generator
64{
65  typedef generator_iterator<Generator> type;
66};
67
68template <class Generator>
69inline generator_iterator<Generator>
70make_generator_iterator(Generator & gen)
71{
72  typedef generator_iterator<Generator> result_t;
73  return result_t(&gen);
74}
75
76} // namespace boost
77
78
79#endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
80