自己实现的二维数组

#include <iostream>using namespace std;class Array2D{public:Array2D(int w, int h){width = w;height = h;arr = new int*[height];for(int i=0; i<height; i++)arr[i] = new int[width];}~Array2D(){for(int i=0; i<height; i++)delete arr[i];delete arr;}int* operator[](int index){return arr[index];}private:int width; //第一维 int height; //第二维int **arr;};int main(){Array2D arr(3, 4);arr[0][0] = 1;cout<<arr[0][0]<<endl;} 

 

//类似矩阵的类如何能产生带两个或更多下标的下标运算符

//operator[]总是精确地带一个参数，但operator()能带任何数量的参数

 

//类似矩阵的类如何能产生带两个或更多下标的下标运算符//operator[]总是精确地带一个参数，但operator()能带任何数量的参数class Martix{public:Martix(){memset(data, 0, rows * cols);}int& operator()(unsigned row, unsigned col){assert(row>=0 && row<=100);assert(col>=0 && col<=100);return data[cols*row + col];}const int& operator()(unsigned row, unsigned col) const{assert(row>=0 && row<=100);assert(col>=0 && col<=100);return data[cols*row + col];}private:enum{rows = 100, cols = 100};int data[rows * cols];};int main(){Martix m;m(0, 1) = 5;cout<<m(3, 4)<<endl;return 0;}