类和对象（15）——强化练习（2）自定义的数组类

//MyArray.h

#pragma once
#include <iostream>
using namespace std;
class MyArray
{
public:
    MyArray();
    MyArray(int len);
    MyArray(const MyArray &another);
    ~MyArray();

    void setData(int index, int data);
    int getData(int index);
    int getLen();

    void operator=(const MyArray& another);

private:
    int len;
    int *space;
};

//MyArray.cpp

#include "MyArray.h"

MyArray::MyArray()
{
    cout << "MyArray()..." << endl;
    this->len = 0;
    this->space = NULL;
}

MyArray::MyArray(int len)
{
    if (len <= 0)
    {
        this->len = 0;
        return;
    }
    else
    {
        this->len = len;
        this->space = new int[this->len];
        cout << "MyArray::MyArray(int len)..." << endl;
    }
}

MyArray::MyArray(const MyArray &another)
{
    if (another.len >= 0)
    {
        this->len = another.len;
        
        //深拷贝
        this->space = new int[this->len];
        for (int i = 0;i < this->len;i++)
        {
            this->space[i] = another.space[i];
        }
        cout << "MyArray::MyArray(const MyArray &)..." << endl;
    }
}

void MyArray::setData(int index, int data)
{
    if (this->space != NULL)
    {
        this->space[index] = data;
    }
}

int MyArray::getData(int index)
{
    return this->space[index];
}

int MyArray::getLen()
{
    return this->len;
}


MyArray::~MyArray()
{
    if (this->space != NULL)
    {
        delete[]this->space;
        this->space = NULL;
        len = 0;
        cout << "MyArray::~MyArray()..." << endl;
    }
}

void MyArray::operator=(const MyArray & another)
{
    if (another.len >= 0)
    {
        this->len = another.len;

        //深拷贝
        this->space = new int[this->len];
        for (int i = 0;i < this->len;i++)
        {
            this->space[i] = another.space[i];
        }
        cout << "MyArray::operator=(const MyArray &)..." << endl;
    }
}

//main.cpp

#include <iostream>
#include "MyArray.h"
using namespace std;

int main(void)
{
    MyArray array1(10);//开辟10元素的数组

    for (int i=0;i < 10;i++) 
    {
        array1.setData(i, i + 10);
    }
    cout << "----------" << endl;
    cout << "array1:" << endl;

    for (int i=0;i < 10;i++)
    {
        cout << array1.getData(i)<<" ";
    }
    cout << endl;

    MyArray array2 = array1;
    cout << "array2:" << endl;
    for (int i = 0;i < array2.getLen();i++)
    {
        cout << array2.getData(i) << " ";
    }
    cout << endl;
    
    MyArray  array3;
    array3 = array1;
    cout << "array3:" << endl;
    for (int i = 0;i < array3.getLen();i++)
    {
        cout << array3.getData(i) << " ";
    }
    cout << endl;

    return 0;
}