CMatrixTemplateObjects.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
#ifndef CMatrixTemplateObjects_H
#define CMatrixTemplateObjects_H
 
#include <mrpt/math/CMatrixTemplate.h>
 
namespace mrpt
{
namespace math
{
/**  This template class extends the class "CMatrixTemplate" for storing
 *"objects" at each matrix entry.
 *    This class allows a very efficient representation of sparse matrixes where
 *each cell is an arbitrary C++ class,
 *    but its use must carefully observe the following rules:
 *                      - The type in the template especialization MUST be a class with a
 *proper
 *default constructor.
 *                      - Initially all entries are set to nullptr.
 *                      - Pointers can be manually asigned, or automatically created through
 *a
 *call to "CMatrixTemplateObjects<T>::allocAllObjects"
 *                      - Independently of how pointers are asigned, memory will be free by
 *destroying objects for each non-NULL entry in the matrix. In some special
 *situations, the user can indicate not to free those objects by calling
 *"CMatrixTemplateObjects<T>::setDestroyBehavior", then it is up to the user to
 *free the memory. In all cases the default behavior is to free the memory.
 *                      - Asignament operator with matrixes will COPY THE POINTERS, thus a
 *copy
 *of objects is not performed.
 *                      - WARNING: Objects are not deleted while shrinking the matrix by
 *calling
 *"setSize", thus please call ""CMatrixTemplateObjects<T>::freeAllObjects" or
 *manually delete objects before shrinking.
 *
 * \ingroup mrpt_math_grp
 * \sa CMatrixTemplate
 */
template <class T>
class CMatrixTemplateObjects : public CMatrixTemplate<T*>
{
   private:
        bool m_freeObjects;
 
   public:
        /** Copy constructor
        */
        CMatrixTemplateObjects(const CMatrixTemplate<T>& m)
                : CMatrixTemplate<T*>(m), m_freeObjects(true)
        {
        }
 
        /** Constructor
        */
        CMatrixTemplateObjects(size_t row = 3, size_t col = 3)
                : CMatrixTemplate<T*>(row, col), m_freeObjects(true)
        {
                for (size_t i = 0; i < CMatrixTemplate<T*>::rows(); i++)
                        for (size_t j = 0; j < CMatrixTemplate<T*>::cols(); j++)
                                CMatrixTemplate<T*>::m_Val[i][j] = nullptr;
        }
 
        /** Changes the size of matrix
        */
        virtual void setSize(size_t row, size_t col)
        {
                // TODO: BUGFIX. Doesn't remove objetcs if row<m_Row or col<m_Col
                CMatrixTemplate<T*>::realloc(row, col, true);
        }
 
        /** Destructor
          */
        virtual ~CMatrixTemplateObjects()
        {
                if (m_freeObjects) freeAllObjects();
        }
 
        /** Delete all the objects in the matrix and set all entries to nullptr.
          */
        void freeAllObjects()
        {
                for (size_t i = 0; i < CMatrixTemplate<T*>::rows(); i++)
                        for (size_t j = 0; j < CMatrixTemplate<T*>::cols(); j++)
                                if (CMatrixTemplate<T*>::m_Val[i][j] != nullptr)
                                {
                                        delete CMatrixTemplate<T*>::m_Val[i][j];
                                        CMatrixTemplate<T*>::m_Val[i][j] = nullptr;
                                }
        }
 
        /** Assignment operator
        */
        CMatrixTemplateObjects& operator=(const CMatrixTemplateObjects& m)
        {
                CMatrixTemplate<T*>::realloc(m.rows(), m.cols());
 
                for (size_t i = 0; i < CMatrixTemplate<T*>::rows(); i++)
                        for (size_t j = 0; j < CMatrixTemplate<T*>::cols(); j++)
                                CMatrixTemplate<T*>::m_Val[i][j] = m.m_Val[i][j];
                return *this;
        }
 
        /** Sets the behavior on matrix destroy.
          * See the general description of the class on the top.
          */
        void setDestroyBehavior(bool freeObjects = true)
        {
                m_freeObjects = freeObjects;
        }
 
        /** Alloc memory for all the non-NULL entries in the matrix.
          * See the general description of the class on the top.
          */
        void allocAllObjects()
        {
                for (size_t i = 0; i < CMatrixTemplate<T*>::rows(); i++)
                        for (size_t j = 0; j < CMatrixTemplate<T*>::cols(); j++)
                                if (nullptr == CMatrixTemplate<T*>::m_Val[i][j])
                                        CMatrixTemplate<T*>::m_Val[i][j] = new T();
        }
 
};  // end of class definition
 
}  // End of namespace
}  // End of namespace
 
#endif