Re: operator[][][]
Carl Barron posted:
template <class T,size_t cols,size_t rows>
class Matrix
{
T data[rows*cols];
public:
struct subscript_proxy
{
T *data;
int i;
subscript_proxy(T *a,int b):data(a),i(b){}
T & operator [] (int j) {return data[i+j];}
};
subscript_proxy operator [] (int i)
{
return subscript_proxy(data,i*cols);
}
};
or build an array of T*s in the ctor
template<class T,size_t rows,size_t cols>
class Matrix
{
T data[rows*cols];
T *row_start[rows];
{
Matrix()
{
T *p = data;
for(int i=0;i!=rows;++i,p+=cols)
row_start[i] = p;
}
T * operator [] (int i) {return row_start[i];}
};
now Matrix A;
x = A[i][j] first calls Matrix::operator [](i) and then the
operator [](j) [either the built in for double * , or
subscript_proxy::operator [] depending on which of above
implementations is used ]
Yes, I'm well aware of that method. (A recent post of mine:
http://groups.google.ie/group/comp.lang.c++/msg/78fa7e8bb91e8525?hl=en& )
Code would be a lot nicer (and would perform a lot better) if we could
simply define:
T &operator[][][](unsigned,unsigned,unsigned);
--
Frederick Gotham
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