C ++ implements a two-dimensional array class

#ifndef __H_MATRIX_H__#define __H_MATRIX_H__#include <vector>using namespace std;template<typename Object>class matrix{public:matrix(int rows, int cols):array(rows){for (int i=0; i<rows; i++)array[i].resize(cols);}const vector<Object> & operator[](int row)const{return array[row];}vector<Object>& operator[](int row){return array[row];}int numrows()const{return array.size();}int numcols()const{return numrows() ? array[0].size() : 0;}private:vector< vector<Object> > array;};#endif//__H_MATRIX_H__

Test. cpp

#include "matrix.h"#include <iostream>using namespace std;int main(){matrix<int> matrixArray(3,5);int i,j;for (i=0; i<matrixArray.numrows(); i++){for(j=0; j<matrixArray.numcols(); j++)matrixArray[i][j] = i+j;}for (i=0; i<matrixArray.numrows(); i++){for(j=0; j<matrixArray.numcols(); j++)cout<< matrixArray[i][j]<<ends;cout<<endl;}return 0;}