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74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
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// (C) Copyright Jens Maurer 2001. Permission to copy, use,
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// modify, sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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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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#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_adaptors.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_policies
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{
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public:
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generator_iterator_policies() { }
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template<class Base>
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void initialize(Base& base) {
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m_value = (*base)();
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}
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// The Iter template argument is necessary for compatibility with a MWCW
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// bug workaround
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template <class IteratorAdaptor>
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void increment(IteratorAdaptor& iter) {
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m_value = (*iter.base())();
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}
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template <class IteratorAdaptor>
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const typename Generator::result_type&
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dereference(const IteratorAdaptor&) const
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{ return m_value; }
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template <class IteratorAdaptor1, class IteratorAdaptor2>
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bool equal(const IteratorAdaptor1& x, const IteratorAdaptor2& y) const
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{ return x.base() == y.base() &&
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x.policies().m_value == y.policies().m_value; }
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private:
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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 iterator_adaptor<Generator*, generator_iterator_policies<Generator>,
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typename Generator::result_type, const typename Generator::result_type&,
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const typename Generator::result_type*, std::input_iterator_tag,
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long> type;
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};
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template <class Generator>
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inline typename generator_iterator_generator<Generator>::type
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make_generator_iterator(Generator & gen)
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{
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typedef typename generator_iterator_generator<Generator>::type 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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