//自定义数组类
#include<iostream>
using namespace std;//分析：能获取数组长度，添加元素，删除元素，修改元素
//要求重载[],=,==,!=运算符class MyArray
{
private:int mLength;int* mSpace;public:MyArray(int length){cout << "有参构造函数被调用了1" << endl;mLength = length;mSpace = new int[mLength];memset(mSpace, 0, sizeof(int)*mLength);}MyArray(const MyArray& obj){cout << "拷贝构造函数被调用了2" << endl;mLength = obj.mLength;mSpace = new int[mLength];int i = 0;for (i = 0; i < mLength; i++){mSpace[i] = obj.mSpace[i];}}int length(){return mLength;}void setData(int index, int value){if (index>(mLength-1)){cout << "数组越界！" << endl;return;}mSpace[index] = value;}int getData(int index){if (index>(mLength - 1)){cout << "数组越界！" << endl;return 0;}return mSpace[index];}void PrintfA(){for (int i = 0; i < mLength; i++){cout << "第"<<i<<"个元素是" << mSpace[i] << endl;}}~MyArray(){cout << "析构函数被调用了3" << endl;if (mSpace!=NULL){delete[] mSpace;}mLength = 0;}
public://[]操作符重载int & operator[](int num){if (num>(mLength-1)){cout << "数组越界！" << endl;return mSpace[mLength - 1];}return mSpace[num];}//=操作符重载MyArray & operator=(MyArray &obj){mLength = obj.mLength;if (mSpace==NULL){mSpace = new int[mLength];}else{//释放原来的数组内存delete[] mSpace;mSpace = new int[mLength];}int i = 0;for (i = 0; i < mLength; i++){mSpace[i] = obj.mSpace[i];}return *this;}//==操作符重载bool operator==(MyArray &myarr){bool flag = true;if (mLength != myarr.mLength){flag = false;return flag;}for (int i = 0; i < mLength; i++){if (mSpace[i] != myarr.mSpace[i]){flag = false;break;}}return flag;}//!=操作符重载bool operator!=(MyArray &myarr){bool flag = false;if (mLength == myarr.mLength){for (int i = 0; i < mLength; i++){if (mSpace[i] != myarr.mSpace[i]){flag = true;break;}}}else{flag = true;}return flag;}};void ProtectA(){MyArray arr(10);arr.PrintfA();//arr[10];  arr[10]=2;//根据需求推理出参数列表是Int  返回值是int &//int & arr.operator[](int num)arr[5]=5;arr.PrintfA();//arr1=arr;  赋值操作//分析可知：函数名operator=()  ；操作数 2个（不涉及系统类库）arr.operator=(MyArray &arr1) //因为存在 arr1=arr2=arr3; 所以返回值MyArray & ；结果：MyArray & operator=(MyArray &arr1) MyArray arr2(5);arr2[0] = 1;arr2[2] = 1;arr2[3] = 1;arr2[4] = 1;arr2[1] = 1;arr = arr2;arr.PrintfA();}void ProtectB(){//arr1==arr;  判断是否相等//分析 ：函数名 operator==(), 有2个操作数  arr1.operator==(arr)  返回值：判断是否相等 那么肯定返回bool值//结果：bool operator==(MyArray &myarr)MyArray arr1(3), arr2(5);if (arr1 == arr2){cout << "这两个数组相等" << endl;}else{cout << "这两个数组不相等" << endl;}if (arr1 != arr2){cout << "这两个数不组相等" << endl;}else{cout << "这两个数组相等" << endl;}
}void main(){ProtectB();system("pause");
}