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CloneVector.h
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Fri, Nov 1, 13:34

CloneVector.h
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#ifndef CLONEVECTOR_H
#define CLONEVECTOR_H
#include "Vector.h"
template<typename T>
class CloneVector : public Vector<T>
{
public:
CloneVector(); // do not implement
CloneVector(const Vector<T> &c);
CloneVector(const Matrix<T> &c, int dim, INDEX idx=0);
CloneVector(const DiagonalMatrix<T> &c, INDEX idx=0);
// overloaded virtual functions
T& operator[](INDEX i);
T operator[](INDEX i) const;
T operator()(INDEX i, INDEX j=0) const;
T& operator()(INDEX i, INDEX j=0);
INDEX nRows() const;
CloneVector<T>& operator=(const T &v);
CloneVector<T>& operator=(const CloneVector<T> &C);
CloneVector<T>& operator=(const Matrix<T> &C);
virtual bool memory_contiguous() const;
T* get_ptr() const;
void resize(INDEX nRows, INDEX nCols=0, bool copy=false);
void reset(INDEX nRows, INDEX nCols=0, bool zero=true);
void copy(const T * ptr, INDEX nRows, INDEX nCols=0);
private:
void _resize(INDEX nRows, INDEX nCols, bool copy, bool zero);
Vector<T> * const _baseV; // ptr to a base vector
Matrix<T> * const _baseM; // ptr to a base matrix
int _clone_type; // what to clown (see enum CLONE_TYPE)
INDEX _idx; // index of matrix dimension to clone
};
///////////////////////////////////////////////////////////////////////////////
// Template definitions ///////////////////////////////////////////////////////
//-----------------------------------------------------------------------------
// Construct from another vector
//-----------------------------------------------------------------------------
template<typename T>
CloneVector<T>::CloneVector(const Vector<T> &c)
: Vector<T>(), _baseV(const_cast<Vector<T>*>(&c)), _baseM(NULL)
{}
//-----------------------------------------------------------------------------
// Construct from a matrix, the const_cast isn't pretty
/* CloneVector(const Matrix<T> &c, int dim, INDEX idx)
/ attaches to a slice of a matrix
/ Arguments: c = pointer to the matrix
/ dim = type of slice CLONE_ROW, CLONE_COL, CLONE_DIAG
/ idx = index of row or column (no effect on diag currently)
*/
//-----------------------------------------------------------------------------
template<typename T>
CloneVector<T>::CloneVector(const Matrix<T> &c, int dim, INDEX idx)
: Vector<T>(), _baseV(NULL), _baseM(const_cast<Matrix<T>*>(&c))
, _clone_type(dim), _idx(idx)
{}
//-----------------------------------------------------------------------------
// Construct from a DiagonalMatrix
//-----------------------------------------------------------------------------
template<typename T>
CloneVector<T>::CloneVector(const DiagonalMatrix<T> &c, INDEX idx)
: Vector<T>(), _baseV(NULL), _baseM(const_cast<DiagonalMatrix<T>*>(&c))
, _clone_type(CLONE_DIAG), _idx(0)
{}
//-----------------------------------------------------------------------------
// value (const) indexing operator
//-----------------------------------------------------------------------------
template<typename T>
T CloneVector<T>::operator()(INDEX i, INDEX j) const
{
return (*this)[i];
}
//-----------------------------------------------------------------------------
// reference index operator
//-----------------------------------------------------------------------------
template<typename T>
T& CloneVector<T>::operator()(INDEX i, INDEX j)
{
return (*this)[i];
}
//-----------------------------------------------------------------------------
// Indexes the cloned vector either from another vector or a matrix
//-----------------------------------------------------------------------------
template<typename T>
T CloneVector<T>::operator[](INDEX i) const
{
if (_baseV) return (*_baseV)(i);
if (_clone_type == CLONE_ROW) return (*_baseM)(_idx, i);
else if (_clone_type == CLONE_COL) return (*_baseM)(i,_idx);
else if (_clone_type == CLONE_DIAG) return (*_baseM)(i,i);
return 0;
}
//-----------------------------------------------------------------------------
// Indexes the cloned vector either from another vector or a matrix
//-----------------------------------------------------------------------------
template<typename T>
T& CloneVector<T>::operator[](INDEX i)
{
if (_baseV) return (*_baseV)(i);
if (_clone_type == CLONE_ROW) return (*_baseM)(_idx, i);
if (_clone_type == CLONE_COL) return (*_baseM)(i,_idx);
if (_clone_type == CLONE_DIAG) return (*_baseM)(i,i);
return (*_baseV)(i);
}
//-----------------------------------------------------------------------------
// Returns the size of the base vector or of the row/col of the base matrix
//-----------------------------------------------------------------------------
template<typename T>
INDEX CloneVector<T>::nRows() const
{
using std::min;
if (_baseV) return _baseV->size();
if (_clone_type == CLONE_ROW) return _baseM->nCols();
if (_clone_type == CLONE_COL) return _baseM->nRows();
if (_clone_type == CLONE_DIAG) return min(_baseM->nRows(), _baseM->nCols());
return 0;
}
//-----------------------------------------------------------------------------
// assigns all elements to a constant
//-----------------------------------------------------------------------------
template<typename T>
CloneVector<T>& CloneVector<T>::operator=(const T &v)
{
this->set_all_elements_to(v); // NOTE: DO NOT do _baseX->set_elements_to()
return *this;
}
//-----------------------------------------------------------------------------
// assigns all elements to the corresponding elements in C
//-----------------------------------------------------------------------------
template<typename T>
CloneVector<T>& CloneVector<T>::operator=(const CloneVector<T> &C)
{
GCK(*this, C, this->size()!=C.size(), "Error in CloneVector:operator=");
FORi VIDX(i) = C[i];
return *this;
}
//-----------------------------------------------------------------------------
// assigns all elements to the corresponding elements in C
//-----------------------------------------------------------------------------
template<typename T>
CloneVector<T>& CloneVector<T>::operator=(const Matrix<T> &C)
{
GCK(*this, C, this->size()!=C.size(), "Error in CloneVector:operator=");
FORi VIDX(i) = C[i];
return *this;
}
//-----------------------------------------------------------------------------
// returns true only if its guaranteed memory is contiguous
//-----------------------------------------------------------------------------
template<typename T>
bool CloneVector<T>::memory_contiguous() const
{
// drill down through clone of clones
if (_baseV) return _baseV->memory_contiguous();
// could be okay if DiagonalMatrix, but can't guarantee this
if (_clone_type == CLONE_DIAG) return false;
#ifdef ROW_STORAGE
return _clone_type == CLONE_ROW;
#else
return _clone_type == CLONE_COL;
#endif
}
//-----------------------------------------------------------------------------
// Returns a pointer to the data unless the data is a column of a matrix
//-----------------------------------------------------------------------------
template<typename T>
T* CloneVector<T>::get_ptr() const
{
if (_baseV) return _baseV->get_ptr();
#ifdef ROW_STORAGE
if (_clone_type == CLONE_ROW) return _baseM->get_ptr() + this->size()*_idx;
if (_clone_type == CLONE_COL) return _baseM->get_ptr() + this->size();
if (_clone_type == CLONE_DIAG) return _baseM->get_ptr();
#else
if (_clone_type == CLONE_COL) return _baseM->get_ptr() + this->size()*_idx;
if (_clone_type == CLONE_ROW) return _baseM->get_ptr() + this->size();
if (_clone_type == CLONE_DIAG) return _baseM->get_ptr();
#endif
return 0;
}
//-----------------------------------------------------------------------------
// general resize function, can handle parents that are matrices or vectors
//-----------------------------------------------------------------------------
template<typename T>
void CloneVector<T>::_resize(INDEX nRows, INDEX nCols, bool copy, bool zero)
{
if (_baseV)
{
if (copy) _baseV->resize(nRows, nCols, copy);
else _baseV->reset (nRows, nCols, zero);
return;
}
// parent is a matrix, need to decide what the Vector is cloning
switch (_clone_type)
{
case CLONE_ROW: // now the leading dimension is rows
nCols = nCols ? nCols : _baseM->nCols();
break;
case CLONE_COL: // now the leading dimension is columns
nCols = nCols ? nCols : _baseM->nRows();
Utility::Swap(nRows, nCols);
break;
case CLONE_DIAG: // lets just hope you knew what you were doing
break;
default:
return;
}
if (zero) _baseM->reset(nRows, nCols, zero); // zero overrides copy
else _baseM->resize(nRows, nCols, copy);
}
//-----------------------------------------------------------------------------
// resizes the matrix and optionally copies what fits
//-----------------------------------------------------------------------------
template<typename T>
void CloneVector<T>::resize(INDEX nRows, INDEX nCols, bool copy)
{
_resize(nRows, nCols, copy, false);
}
//-----------------------------------------------------------------------------
// resizes the matrix and optionally zeros it out
//-----------------------------------------------------------------------------
template<typename T>
void CloneVector<T>::reset(INDEX nRows, INDEX nCols, bool zero)
{
_resize(nRows, nCols, false, zero);
}
//-----------------------------------------------------------------------------
// resizes the matrix and copies data
//-----------------------------------------------------------------------------
template<typename T>
void CloneVector<T>::copy(const T * ptr, INDEX nRows, INDEX nCols)
{
_resize(nRows, nCols, false, false);
memcpy(this->get_ptr(), ptr, this->size()*sizeof(T));
}
#endif

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