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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
//
// Eigen 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 3 of the License, or (at your option) any later version.
//
// Alternatively, you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// Eigen 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 or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_SPARSE_ARRAY_H
#define EIGEN_SPARSE_ARRAY_H
/** Stores a sparse set of values as a list of values and a list of indices.
*
*/
template<typename Scalar> class SparseArray
{
public:
SparseArray()
: m_values(0), m_indices(0), m_size(0), m_allocatedSize(0), m_isShared(0)
{}
SparseArray(int size)
: m_values(0), m_indices(0), m_size(0), m_allocatedSize(0), m_isShared(0)
{
resize(size);
}
SparseArray(const SparseArray& other)
{
*this = other;
}
SparseArray& operator=(const SparseArray& other)
{
resize(other.size());
memcpy(m_values, other.m_values, m_size * sizeof(Scalar));
memcpy(m_indices, other.m_indices, m_size * sizeof(int));
m_isShared = 0;
}
void shallowCopy(const SparseArray& other)
{
delete[] m_values;
delete[] m_indices;
m_values = other.m_values;
m_indices = other.m_indices;
m_size = other.m_size;
m_allocatedSize = other.m_allocatedSize;
m_isShared = false;
other.m_isShared = true;
}
~SparseArray()
{
if (!m_isShared)
{
delete[] m_values;
delete[] m_indices;
}
}
void reserve(int size)
{
int newAllocatedSize = m_size + size;
if (newAllocatedSize > m_allocatedSize)
{
Scalar* newValues = new Scalar[newAllocatedSize];
int* newIndices = new int[newAllocatedSize];
// copy
memcpy(newValues, m_values, m_size * sizeof(Scalar));
memcpy(newIndices, m_indices, m_size * sizeof(int));
// delete old stuff
delete[] m_values;
delete[] m_indices;
m_values = newValues;
m_indices = newIndices;
m_allocatedSize = newAllocatedSize;
}
}
void resize(int size, int reserveSizeFactor = 0)
{
if (m_allocatedSize<size)
{
int newAllocatedSize = size + reserveSizeFactor*size;
Scalar* newValues = new Scalar[newAllocatedSize];
int* newIndices = new int[newAllocatedSize];
// copy
memcpy(newValues, m_values, m_size * sizeof(Scalar));
memcpy(newIndices, m_indices, m_size * sizeof(int));
// delete old stuff
delete[] m_values;
delete[] m_indices;
m_values = newValues;
m_indices = newIndices;
m_allocatedSize = newAllocatedSize;
}
m_size = size;
}
void append(const Scalar& v, int i)
{
int id = m_size;
resize(m_size+1, 1);
m_values[id] = v;
m_indices[id] = i;
}
int size() const { return m_size; }
void clear()
{
m_size = 0;
}
Scalar& value(int i) { return m_values[i]; }
Scalar value(int i) const { return m_values[i]; }
int& index(int i) { return m_indices[i]; }
int index(int i) const { return m_indices[i]; }
protected:
Scalar* m_values;
int* m_indices;
int m_size;
struct {
int m_allocatedSize:31;
mutable int m_isShared:1;
};
};
#endif // EIGEN_SPARSE_ARRAY_H
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