40.C++动态数组类

#include <iostream>
#include <cassert>
using namespace std;


class Point {
public://外部接口
	Point() :x(0), y(0) {
		cout << "Default Constructor called"<<endl;
	}
	Point(int x ,int y) : x(x), y(y) {//构造函数
		cout << "Constructor called" << endl;
	}
	~Point() { cout << "Destructor called"<<endl; }
	void move(int newX, int newY) {
		x = newX;
		y = newY;
	}
private:
	int x, y;
};

//动态数组类
class ArrayOfPoints {
public:
	ArrayOfPoints(int size) :size(size) {
		points = new Point[size];

	}
	~ArrayOfPoints(){
		cout << "Deleting ...";
		delete[] points;
	}
	//获取下标为index的数据元素
	Point& element(int index) {
		assert(index >= 0 && index < size);//如果数组下标越界，程序终止
		return points[index];
	}

private:
	Point* points;//指向动态数组首地址
	int size;//数组大小

};




int main() {//主函数
	int count;
	cout << "Please enter the count of points:";
	cin >> count;
	ArrayOfPoints points(count);
	points.element(0).move(5, 0);//访问数组元素的成员
	points.element(1).move(15, 20); // 访问数组元素的成员
	return 0;

}