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// ***********************************************************************
//
// Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
// Copyright (2003) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef SPARSE_ELEMENT_H
#define SPARSE_ELEMENT_H
#include "AbstractLinAlgPack_Types.hpp"
namespace AbstractLinAlgPack {
/** \brief Sparse storage element type.
*
* This class abstracts a sparse element of a templated
* type. It is ment to be used in a sparse vector. Objects of
* this type are designed so that the size of the object is
* the same at least two value_type objects.
*
* The default assignment operator and copy constructor
* are allowed.
*/
template <class T_Index, class T_Value>
class SparseElement {
public:
/** @name Public Typedefs. */
//@{
/** \brief . */
typedef T_Value value_type;
/** \brief . */
typedef T_Index index_type;
//@}
/** @name Constructors */
//@{
/// Construct uninitialized (#value() == 0.0#, #index() == 0#).
SparseElement()
{
idx_pad_.index_ = 0;
value_ = 0.0;
}
/// Construct with a value and index set
SparseElement(index_type index, value_type value)
{
idx_pad_.index_ = index;
value_ = value;
}
//@}
/** @name Value and index access */
//@{
/** \brief . */
value_type& value()
{
return value_;
}
/** \brief . */
const value_type& value() const
{
return value_;
}
/** \brief . */
const index_type& index() const
{
return idx_pad_.index_;
}
/// Initialize
void initialize(index_type index, value_type value) {
idx_pad_.index_ = index;
value_ = value;
}
/// Change the index
void change_index(index_type index)
{
idx_pad_.index_ = index;
}
//@}
private:
union index_and_padding {
value_type dummy; // This is just included for alignment
index_type index_; // so that sizeof(this) == 2*sizeof(value_type)
};
index_and_padding idx_pad_;
value_type value_;
}; // end class SparseElement
} // end namespace AbstractLinAlgPack
#endif // SPARSE_ELEMENT_H
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