C++实现一个二维数组类

#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;
}