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//=======================================================================
// Copyright 2002 Indiana University.
// Copyright 2009 Trustees of Indiana University.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek, Michael Hansen
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#ifndef BOOST_GRAPH_DETAIL_INCREMENTAL_COMPONENTS_HPP
#define BOOST_GRAPH_DETAIL_INCREMENTAL_COMPONENTS_HPP
#include <boost/operators.hpp>
namespace boost {
namespace detail {
// Iterator for a component index linked list. The contents of
// each array element represent the next index in the list. A
// special value (the maximum index + 1) is used to terminate a
// list.
template <typename IndexRandomAccessIterator>
class component_index_iterator :
boost::forward_iterator_helper<component_index_iterator<IndexRandomAccessIterator>,
typename std::iterator_traits<IndexRandomAccessIterator>::value_type,
typename std::iterator_traits<IndexRandomAccessIterator>::difference_type,
typename std::iterator_traits<IndexRandomAccessIterator>::pointer,
typename std::iterator_traits<IndexRandomAccessIterator>::reference> {
private:
typedef component_index_iterator<IndexRandomAccessIterator> self;
public:
typedef std::forward_iterator_tag iterator_category;
typedef typename std::iterator_traits<IndexRandomAccessIterator>::value_type value_type;
typedef typename std::iterator_traits<IndexRandomAccessIterator>::difference_type reference;
typedef typename std::iterator_traits<IndexRandomAccessIterator>::pointer pointer;
typedef typename std::iterator_traits<IndexRandomAccessIterator>::reference difference_type;
// Constructor for "begin" iterator
component_index_iterator(IndexRandomAccessIterator index_iterator,
value_type begin_index) :
m_index_iterator(index_iterator),
m_current_index(begin_index) { }
// Constructor for "end" iterator (end_index should be the linked
// list terminator).
component_index_iterator(value_type end_index) :
m_current_index(end_index) { }
inline value_type operator*() const {
return (m_current_index);
}
self& operator++() {
// Move to the next element in the linked list
m_current_index = m_index_iterator[m_current_index];
return (*this);
}
bool operator==(const self& other_iterator) const {
return (m_current_index == *other_iterator);
}
protected:
IndexRandomAccessIterator m_index_iterator;
value_type m_current_index;
}; // class component_index_iterator
} // namespace detail
} // namespace detail
#endif // BOOST_GRAPH_DETAIL_INCREMENTAL_COMPONENTS_HPP
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