数组类封装

#include <iostream>
using namespace std;
template<class T>
class MyArray
{
public:

	//有参构造  参数 容量
	MyArray(int capacity)
	{
		//cout << "Myarray有参构造调用" << endl;
		this->m_Capacity = capacity;
		this->m_Size = 0;
		this->pAddress = new T[this->m_Capacity];
	}

	//拷贝构造
	MyArray(const MyArray& arr)
	{
		//cout << "Myarray拷贝构造调用" << endl;
		this->m_Capacity = arr.m_Capacity;
		this->m_Size = arr.m_Size;
		//this->pAddress = arr.pAddress;


		//深拷贝
		this->pAddress =  new T[arr.m_Capacity];

		//将arr中的数据都拷贝过来
		for (int i = 0; i < this->m_Size; i++)
		{
			this->pAddress[i] = arr.pAddress[i];
		}
	}

	//operator= 防止浅拷贝问题   
	MyArray& operator=(const MyArray& arr)
	{
		//cout << "Myarray  的 operator=调用" << endl;
		//先判断原来堆区是否有数据，如果有先释放
		if (this->pAddress != NULL)
		{
			delete[] this->pAddress;
			this->pAddress = NULL;
			this->m_Capacity = 0;
			this->m_Size = 0;
		}

		//深拷贝
		this->m_Capacity = arr.m_Capacity;
		this->m_Size = arr.m_Size;
		this->pAddress =  new T[arr.m_Capacity];
		for (int i = 0; i < this->m_Size; i++)
		{
			this->pAddress[i] = arr.pAddress[i];
		}
		return *this;
	}


	//尾插法
	void Push_Back(const T & val)
	{
		//判断容量是否等于大小
		if (this->m_Capacity == this->m_Size)
		{
			return;
		}
		this->pAddress[this->m_Size] = val; //在数组末尾插入数据
		this->m_Size++; //更新数组大小
	}
	//通过下标方式访问数组中的元素  arr[0] = 100
	T& operator[](int index)
	{
		return this->pAddress[index];
	}


	//返回数组容量
	int getCapacity()
	{
		return this->m_Capacity;
	}
	//返回数组大小
	int getSize()
	{
		return this->m_Size;
	}


	//析构函数
	~MyArray()
	{
		if (this->pAddress != NULL)
		{
			//cout << "Myarray析构函数调用" << endl;
			delete[] this->pAddress;
			this->pAddress = NULL;
		}
	}

private:

	T * pAddress;  //指针指向堆区开辟的真实数组

	int m_Capacity; //数组容量

	int m_Size; //数组大小

};