运算符重载

#ifndef ARRAY_H_INCLUDED
#define ARRAY_H_INCLUDED

#include<iostream>
using namespace std;

class Array
{
public:
    int m_length;      //数组的长度
    int *m_space;      //指向数组的指针
public:
    Array(int length)   //确定数组长度并且给数组分配存储空间
    {
        this->m_length = length;
        m_space = new int[m_length];
    }

    void setData(int index, int value)  //为数组赋值
    {
        m_space[index] = value;
    }

    int getData(int i)      //返回数组元素str[i]的值
    {
        return m_space[i];
    }

    int &operator[](int i)  //运算符[]的重载， 返回值做左值，返回一个引用
    {
        return m_space[i];
    }

    Array& operator=(Array &temp)             //用=进行深拷贝
    {
        if (this->m_space != NULL)      //先清除原来所占的内存
        {
            delete [] m_space;
            m_length = 0;
        }
        this->m_length = temp.m_length;
        this->m_space = new int[m_length];
        for (int i = 0; i < m_length; i++)
        {
            this->m_space[i] = temp[i];
        }
        return *this;
    }

    int operator==(Array &temp) //数组相等返回1，否则返回0
    {
        if (this->m_length != temp.m_length)    //先判断两个数组长度是否相等
            return 0;
        for (int i = 0; i < this->m_length; i++)   //判断数组的各个元素是否相等
        {
            if (this->m_space[i] != temp[i])
                return 0;
        }
        return 1;
    }
};

#endif // ARRAY_H_INCLUDED





#include"Array.h"

int main()
{
    Array a1(10);   //定义数组并分配存储空间
    for (int i = 0; i < a1.m_length; i++)   //初始化数组
    {
        a1.setData(i, i);
    }
    cout << "a1数组元素为:" <<endl;
    for (int i = 0; i < a1.m_length; i++)   //输出数组的值
    {
        cout << a1.getData(i) << " ";
    }
    cout << endl;
   // Array a2 = a1;
    Array a2(5);
        a2 = a1;
        a2[2] = 10;
    cout << "a1[2]: " << a1[2] << endl;
    cout << "a2[2]: " << a2[2] << endl;
    cout << "a2数组元素为:" <<endl;
    for (int i = 0; i < a2.m_length; i++)   //输出数组的值
    {
        cout << a2.getData(i) << " ";
    }
    cout << endl;
    if (a1 == a2)
        cout << "两数组相等" << endl;
    else
        cout << "两数组不相等" << endl;
    return 0;
}