Re: how to overload subscript of 2D-array

/* how to overload the operation [] ,subscipt of 2D-array?
 * how can I get element through piece[i][j],rather than piece(i)[j]?
 * */
#include"global.h"
using namespace std;
class Piece
{
    public:
    Piece()
    {
    for(size_t i = 0;i<2;i++)
        for(size_t j = 0;j<3;j++)
        {
        piece[i][j] = i+ j;
        }
    for(size_t i=0;i<2;i++)
    {
        std::copy(piece[i],piece[i]+3,ostream_iterator<int>(cout," "));
        cout<<endl;
    }
    cout<<"----------------------"<<endl;
    }
    int* operator()(const int& t)//change operator() to operator[] is
wrong ,why?
    {
    i = t; //
    return piece[i];
    }
    int operator[](const int & t)
    {
    return this->operator()(i)[t];
    }
    private:
    int i;//witchout varible i,how can I implement overload the () , []
or[],[]
    int piece[2][3];
};
//----------------------------------------
int main()
{
    Piece p ;
    for(int i=0;i<2;i++)
    {
    for(int j=0;j<3;j++)
    {
         cout<<p(i)[j]<<" ";//p[i][j],??
    }
    cout<<endl;
    }
}
/*
//output is
0 1 2
1 2 3
----------------------
0 1 2
1 2 3
*/