forked from boostorg/utility
81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
// (C) Copyright Jens Maurer 2001.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Revision History:
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// 15 Nov 2001 Jens Maurer
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// created.
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// See http://www.boost.org/libs/utility/iterator_adaptors.htm for documentation.
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#ifndef BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
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#define BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
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#include <boost/iterator/iterator_facade.hpp>
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#include <boost/ref.hpp>
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namespace boost {
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template<class Generator>
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class generator_iterator
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: public iterator_facade<
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generator_iterator<Generator>
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, typename Generator::result_type
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, single_pass_traversal_tag
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, typename Generator::result_type const&
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>
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{
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typedef iterator_facade<
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generator_iterator<Generator>
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, typename Generator::result_type
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, single_pass_traversal_tag
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, typename Generator::result_type const&
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> super_t;
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public:
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generator_iterator() {}
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generator_iterator(Generator* g) : m_g(g), m_value((*m_g)()) {}
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void increment()
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{
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m_value = (*m_g)();
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}
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const typename Generator::result_type&
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dereference() const
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{
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return m_value;
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}
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bool equal(generator_iterator const& y) const
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{
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return this->m_g == y.m_g && this->m_value == y.m_value;
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}
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private:
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Generator* m_g;
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typename Generator::result_type m_value;
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};
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template<class Generator>
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struct generator_iterator_generator
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{
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typedef generator_iterator<Generator> type;
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};
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template <class Generator>
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inline generator_iterator<Generator>
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make_generator_iterator(Generator & gen)
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{
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typedef generator_iterator<Generator> result_t;
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return result_t(&gen);
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}
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} // namespace boost
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#endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
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