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// -*- c++ -*-
//*****************************************************************************
/** @file CVariableIter.h
*
* @author Alexander Dreyer
* @date 2008-03-05
*
* This file defines an stl-like iterator for accessing the variables of monomial.
*
* @par Copyright:
* (c) 2008 by The PolyBoRi Team
**/
//*****************************************************************************
#ifndef polybori_iterators_CVariableIter_h_
#define polybori_iterators_CVariableIter_h_
// include basic definitions
#include <polybori/pbori_defs.h>
BEGIN_NAMESPACE_PBORI
/** @class CVariableIter
* @brief This template class defines an iterator for monomial types.
*
* It uses a given iterator, and converts indices to Boolean variables (via a
* given ring).
**/
template <class Iterator, class VariableType>
class CVariableIter :
public boost::iterator_facade<
CVariableIter<Iterator, VariableType>,
VariableType,
typename Iterator::iterator_category,
VariableType
> {
public:
/// Fixing Iterator type to be extended
typedef Iterator iterator_type;
/// Fixing variables, which is used for dereferencing
typedef VariableType var_type;
/// Fixing ring, which is used to generate variables
typedef typename var_type::ring_type ring_type;
/// Get type of *this
typedef CVariableIter<iterator_type, var_type> self;
/// Default constructor
CVariableIter(): m_iter(), m_ring() {}
/// Constructor for given iterator (and ring)
CVariableIter(const iterator_type& rhs, const ring_type& ring):
m_iter(rhs), m_ring(ring) {}
/// Check, whether end of iteration is reached
bool isEnd() const { return m_iter.isEnd(); }
/// Increment operation
void increment() { ++m_iter; }
/// Constant dereference operator
var_type dereference() const { return var_type(*m_iter, m_ring); }
/// Equality check
bool equal(const self& rhs) const { return m_iter == rhs.m_iter; }
private:
/// The actual iterator
iterator_type m_iter;
/// The ring, we take the variables from
ring_type m_ring;
};
END_NAMESPACE_PBORI
#endif // CVariableIter_h_
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