c++中的动态二维数组

#ifndef MATRIX_H_INCLUDED
#define MATRIX_H_INCLUDED
#include <string>
class Matrix{
    public:
        size_t rows;
        size_t cols;
        size_t **matrix;
        Matrix();
        Matrix(size_t rows, size_t cols);
        ~Matrix();
};


#endif // MATRIX_H_INCLUDED

#include "Matrix.h"

Matrix::Matrix(){
    this->matrix = 0;
}

Matrix::Matrix(size_t rows, size_t cols){
    this->rows=rows;
    this->cols=cols;
    //size_t **q =0;
    this->matrix =new size_t*[rows];
    for(size_t i=0; i        //*((q)+i) = new size_t[cols];
        *(this->matrix+i) = new size_t[cols];
    }
    for(size_t i=0; i        for(size_t j=0; j            this->matrix[i][j]=0;
        }
    }
    size_t a;
}

Matrix::~Matrix(){
    for(size_t i=0; irows; i++){
        delete[] *(this->matrix+i);
    }
    delete[] this->matrix;
}
////*(this->matrix+i)=this->matrix[i] 
//this->matrix + i是指向this->matrix[i]的地址的地址必须用*(this->matrix+i)来取得