Chris@16: // (C) Copyright Jens Maurer 2001.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // Revision History:
Chris@16: 
Chris@16: // 15 Nov 2001   Jens Maurer
Chris@16: //      created.
Chris@16: 
Chris@16: //  See http://www.boost.org/libs/utility/iterator_adaptors.htm for documentation.
Chris@16: 
Chris@16: #ifndef BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
Chris@16: #define BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
Chris@16: 
Chris@16: #include <boost/iterator/iterator_facade.hpp>
Chris@16: #include <boost/ref.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@101: namespace iterators {
Chris@16: 
Chris@16: template<class Generator>
Chris@16: class generator_iterator
Chris@16:   : public iterator_facade<
Chris@16:         generator_iterator<Generator>
Chris@16:       , typename Generator::result_type
Chris@16:       , single_pass_traversal_tag
Chris@16:       , typename Generator::result_type const&
Chris@16:     >
Chris@16: {
Chris@16:     typedef iterator_facade<
Chris@16:         generator_iterator<Generator>
Chris@16:       , typename Generator::result_type
Chris@16:       , single_pass_traversal_tag
Chris@16:       , typename Generator::result_type const&
Chris@16:     > super_t;
Chris@101: 
Chris@16:  public:
Chris@16:     generator_iterator() {}
Chris@16:     generator_iterator(Generator* g) : m_g(g), m_value((*m_g)()) {}
Chris@16: 
Chris@16:     void increment()
Chris@16:     {
Chris@16:         m_value = (*m_g)();
Chris@16:     }
Chris@16: 
Chris@16:     const typename Generator::result_type&
Chris@16:     dereference() const
Chris@16:     {
Chris@16:         return m_value;
Chris@16:     }
Chris@16: 
Chris@16:     bool equal(generator_iterator const& y) const
Chris@16:     {
Chris@16:         return this->m_g == y.m_g && this->m_value == y.m_value;
Chris@16:     }
Chris@16: 
Chris@16:  private:
Chris@16:     Generator* m_g;
Chris@16:     typename Generator::result_type m_value;
Chris@16: };
Chris@16: 
Chris@16: template<class Generator>
Chris@16: struct generator_iterator_generator
Chris@16: {
Chris@16:   typedef generator_iterator<Generator> type;
Chris@16: };
Chris@16: 
Chris@16: template <class Generator>
Chris@16: inline generator_iterator<Generator>
Chris@16: make_generator_iterator(Generator & gen)
Chris@16: {
Chris@16:   typedef generator_iterator<Generator> result_t;
Chris@16:   return result_t(&gen);
Chris@16: }
Chris@16: 
Chris@101: } // namespace iterators
Chris@101: 
Chris@101: using iterators::generator_iterator;
Chris@101: using iterators::generator_iterator_generator;
Chris@101: using iterators::make_generator_iterator;
Chris@101: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP