操作符重载强化训练2-自定义数组类_强化训练

本文链接：https://blog.youkuaiyun.com/bbs375/article/details/52642974

本文介绍了一个简单的C++动态数组类的实现方法，包括构造函数、析构函数、拷贝构造函数、赋值运算符重载、下标运算符重载及相等和不等运算符的重载。

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#include <iostream>
#include "Array1.h"

Array1::Array1(int length)
{
    if (length<0)
    {
        this->mlength = 0;
    }
    this->mlength = length;
    this->mspace = new int[this->mlength];
}

Array1::Array1(const Array1& obj)
{
    this->mlength = obj.mlength;
    this->mspace = new int[obj.mlength];

    for (int i = 0;i<mlength;i++)
    {
        this->mspace[i] = obj.mspace[i];
    }
}
Array1::~Array1()
{
    if (this->mspace!= NULL)
    {
        delete[] this->mspace;
    }
}
int Array1::length()
{
    return this->mlength;
}
void Array1::setData(int index,int value)
{
    if (index>=this->mlength)
    {
        return;
    }
    this->mspace[index] = value;
}
int Array1::getData(int index)
{
    if (index>=this->mlength)
    {
        return -1;
    }
    return this->mspace[index];
}

Array1& Array1::operator=(const Array1 &obj)    
{    
    //1.释放旧内存
    if (this->mspace!=NULL)
    {
        delete[] this->mspace;
        this->mlength = NULL;
        this->mlength = 0;
    }
    //2.根据obj分配新内存
    this->mlength = obj.mlength;
    this->mspace = new int[obj.mlength];
    //3.赋值
    for (int i = 0;i<mlength;i++)
    {
        this->mspace[i] = obj.mspace[i];
    }
    return *this;    
}  
//如果函数返回值当左值 需要返回引用
//需要返回引用 元素本身 而不是一个值
int& Array1::operator[](int i)
{
    return this->mspace[i];
}
bool Array1::operator==(const Array1 &obj)
{
    if (this->mlength != obj.mlength )
    {
        return false;
    }
    for (int i = 0;i<mlength;i++)
    {
        if (this->mspace[i]!= obj.mspace[i])
        {
            return false;
        }
    }
    return true;
}

bool Array1::operator!=(const Array1 &obj)
{
    if (this->mlength != obj.mlength )
    {
        return true;
    }
    for (int i = 0;i<mlength;i++)
    {
        if (this->mspace[i]!= obj.mspace[i])
        {
            return true;
        }
    }
    return false;
}