array2d.h

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/*
*
* Template Numerical Toolkit (TNT): Two-dimensional numerical array
*
* Mathematical and Computational Sciences Division
* National Institute of Technology,
* Gaithersburg, MD USA
*
*
* This software was developed at the National Institute of Standards and
* Technology (NIST) by employees of the Federal Government in the course
* of their official duties. Pursuant to title 17 Section 105 of the
* United States Code, this software is not subject to copyright protection
* and is in the public domain. NIST assumes no responsibility whatsoever for
* its use by other parties, and makes no guarantees, expressed or implied,
* about its quality, reliability, or any other characteristic.
*
*/



#ifndef SPUC_ARRAY2D_H
#define SPUC_ARRAY2D_H

#include <cstdlib>
#include <iostream>
#ifdef SPUC_BOUNDS_CHECK
#include <assert.h>
#endif

namespace SPUC
{
template <class T>
class Array2D 
{


  private:
    T** v_;                  
        int m_;
    int n_;
    int *ref_count_;

        void initialize_(int m, int n);
    void copy_(T* p, const T*  q, int len) const;
    void set_(const T& val);
    void destroy_();
        inline const T* begin_() const;
        inline T* begin_();

  public:

    typedef         T   value_type;

               Array2D();
               Array2D(int m, int n);
               Array2D(int m, int n,  T *a);
               Array2D(int m, int n, const T &a);
    inline Array2D(const Array2D &A);
        inline Array2D & operator=(const T &a);
        inline Array2D & operator=(const Array2D &A);
        inline Array2D & ref(const Array2D &A);
               Array2D copy() const;
                   Array2D & inject(const Array2D & A);
        inline T* operator[](int i);
        inline const T* operator[](int i) const;
        inline int dim1() const;
        inline int dim2() const;
        inline int ref_count() const;
        ~Array2D();
        // NEW
        inline int cols() const;
        inline int rows() const;
        Array2D<T>& newsize(int M, int N) { return(set_size(M,N)); }
        Array2D<T>& set_size(int M, int N) {
                if (dim1() == M && dim2() == N)
            return *this;
        destroy_();
        initialize_(M,N);
        return *this;
        }
        // NEW

};


template <class T>
Array2D<T>::Array2D(const Array2D<T> &A) : v_(A.v_), m_(A.m_), 
        n_(A.n_), ref_count_(A.ref_count_)
{
        (*ref_count_)++;
}



template <class T>
Array2D<T>::Array2D(int m, int n) : v_(0), m_(m), n_(n), ref_count_(0)
{
        initialize_(m,n);
        ref_count_ = new int;
        *ref_count_ = 1;
}



template <class T>
Array2D<T>::Array2D(int m, int n, const T &val) : v_(0), m_(m), n_(n) ,
        ref_count_(0)
{
        initialize_(m,n);
        set_(val);
        ref_count_ = new int;
        *ref_count_ = 1;

}

template <class T>
Array2D<T>::Array2D(int m, int n, T *a) : v_(0), m_(m), n_(n) ,
        ref_count_(0)
{
        T* p = a;
        v_ = new T*[m];
        for (int i=0; i<m; i++)
        {
                v_[i] = p;
                p += n;
        }
        ref_count_ = new int;
        *ref_count_ = 2;                /* this avoid destorying original data. */

}


template <class T>
inline T* Array2D<T>::operator[](int i) 
{ 
#ifdef SPUC_BOUNDS_CHECK
        assert(i >= 0);
        assert(i < m_);
#endif

return v_[i]; 

}

template <class T>
inline const T* Array2D<T>::operator[](int i) const { return v_[i]; }

template <class T>
Array2D<T> & Array2D<T>::operator=(const T &a)
{
        set_(a);
        return *this;
}
template <class T>
Array2D<T> Array2D<T>::copy() const
{
        Array2D A(m_, n_);
        copy_(A.begin_(), begin_(), m_*n_);

        return A;
}


template <class T>
Array2D<T> & Array2D<T>::inject(const Array2D &A)
{
        if (A.m_ == m_ &&  A.n_ == n_)
                copy_(begin_(), A.begin_(), m_*n_);

        return *this;
}





template <class T>
Array2D<T> & Array2D<T>::ref(const Array2D<T> &A)
{
        if (this != &A)
        {
                (*ref_count_) --;
                if ( *ref_count_ < 1 )
                {
                        destroy_();
                }

                m_ = A.m_;
                n_ = A.n_;
                v_ = A.v_;
                ref_count_ = A.ref_count_;

                (*ref_count_) ++ ;
                
        }
        return *this;
}

template <class T>
Array2D<T> & Array2D<T>::operator=(const Array2D<T> &A)
{
        return ref(A);
}

template <class T> inline int Array2D<T>::dim1() const { return m_; }
template <class T> inline int Array2D<T>::rows() const { return m_; }

template <class T> inline int Array2D<T>::dim2() const { return n_; }
template <class T> inline int Array2D<T>::cols() const { return n_; }


template <class T>
inline int Array2D<T>::ref_count() const
{
        return *ref_count_;
}

template <class T>
Array2D<T>::~Array2D()
{
        (*ref_count_) --;

        if (*ref_count_ < 1)
                destroy_();
}

/* private internal functions */

template <class T>
void Array2D<T>::initialize_(int m, int n)
{


        T* p = new T[m*n];
        v_ = new T*[m];
        for (int i=0; i<m; i++)
        {
                v_[i] = p;
                p+=n;
        }
        m_ = m;
        n_ = n;
}

template <class T>
void Array2D<T>::set_(const T& a)
{
        T *begin = &v_[0][0];
        T *end = begin+ m_*n_;

        for (T* p=begin; p<end; p++)
                *p = a;

}

template <class T>
void Array2D<T>::copy_(T* p, const T* q, int len) const
{
        T *end = p + len;
        while (p<end )
                *p++ = *q++;

}

template <class T>
void Array2D<T>::destroy_()
{

        if (v_ != 0)
        {
                delete[] (v_[0]);
                delete[] (v_);
        }

        if (ref_count_ != 0)
                delete ref_count_;
}

template <class T>
const T* Array2D<T>::begin_() const { return &(v_[0][0]); }

template <class T>
T* Array2D<T>::begin_() { return &(v_[0][0]); }

template <class T>
Array2D<T>::Array2D() : v_(0), m_(0), n_(0) 
{
        ref_count_ = new int;
        *ref_count_ = 1;
}





} /* namespace SPUC */

#endif
/* SPUC_ARRAY2D_H */

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