C++类模板案例-构建自己的通用数组

#pragma once
//通用的数组类
#include <iostream>
using namespace std;
template<class T>
class MyArray 
{
private:
	T* pAddress;				//指针指向堆区开辟的真实的数组

	int m_Capacity;				//数组容量

	int m_Size;					//元素个数

public:

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

	}

	//拷贝构造
	MyArray(const MyArray& arr) 
	{
		//cout << "MyArray的拷贝构造调用" << endl;
		this->m_Capacity = arr.m_Capacity;
		this->m_Size = arr.m_Size;
		//深拷贝
		this->pAddress = new T[arr.m_Capacity];


		//将arr中数据copy过来
		for (int i = 0; i < this->m_Size; i++)
		{
			this->pAddress[i] = arr.pAddress[i];
		}
	}


	//operator= 防止浅copy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，有，先释放
		if (this->pAddress!=NULL)
		{
			delete[] this->pAddress;
			this->pAddress = NULL;
			this->m_Capacity = 0;
			this->m_Size = 0;
		}


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


	//尾插法
	void Push_Back(const T& val) 
	{
		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
	
	}


	//尾删法
	void Pop_Back()
	{
		//让用户访问不到最后一个元素，即为尾删，逻辑删除
		if (this->m_Size ==0)
		{
			return;
		}
		this->m_Size--;
	
	
	}


	//通过下标的方式访问数组中的元素
	//返回T& 可以作为左值使用  arr[0]=100

	T& operator[](int index) 
	{
		return this->pAddress[index];
	}

	//返回数组的容量
	int getCapacity() 
	{
		return this->m_Capacity;
	}

	//返回数组的大小
	int getSize() 
	{
		return this->m_Size;
	}

	//析构函数
	~MyArray() 
	{
		
		if (this->pAddress!=NULL)
		{
			//cout << "MyArray的析构调用" << endl;
			delete[] this->pAddress;
			this->pAddress = NULL;
			this->m_Capacity = 0;
			this->m_Size = 0;
		}
	}

};

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

void PrintIntArray(MyArray<int>& arr)
{
	for (int i = 0; i < arr.getSize(); i++)
	{
		cout << arr[i] << endl;
	}

}

void test01() 
{
	MyArray<int> arr1(5);
	//MyArray<int> arr2(arr1);

	//MyArray<int> arr3(100);
	//arr3 = arr1;

	for (int i = 0; i < 5; i++)
	{
		arr1.Push_Back(i);						//尾插法向数组中插入数据
	}
	cout << "arr1的打印输出" << endl;

	PrintIntArray(arr1);
	cout << "arr1的容量为：" << arr1.getCapacity() << endl;
	cout << "arr1的大小为：" << arr1.getSize() << endl;

	MyArray<int> arr2(arr1);
	cout << "arr2的打印输出" << endl;
	PrintIntArray(arr2);

	arr2.Pop_Back();
	cout << "arr2尾删后：" << endl;
	cout << "arr2的容量为：" << arr2.getCapacity() << endl;
	cout << "arr2的大小为：" << arr2.getSize() << endl;

}

//测试自定义的数据类型
class Person
{
public:
	string m_Name;
	int m_Age;
	Person() {};
	Person(string name, int age) :m_Name(name), m_Age(age) {};


};

void PrintPersonArray(MyArray<Person>& arr) 
{
	for (int i = 0; i < arr.getSize(); i++)
	{
		cout << arr[i].m_Name << "  " << arr[i].m_Age << endl;
	}

}

void test02() 
{
	MyArray<Person> arr(10);
	Person p1("孙悟空", 999);
	Person p2("韩信", 20);
	Person p3("妲己", 30);
	Person p4("赵云", 25);
	Person p5("安其拉", 27);

	//将数据插入到数组中
	arr.Push_Back(p1);
	arr.Push_Back(p2);
	arr.Push_Back(p3);
	arr.Push_Back(p4);
	arr.Push_Back(p5);

	PrintPersonArray(arr);

	cout <<"arr的容量："<< arr.getCapacity() << endl;
	cout <<"arr的大小："<< arr.getSize() << endl;
}


int main() 
{
	test02();
}