制造通用模板，创建自定义的数组

自定义数组.hpp--文件

#pragma once
#include<iostream>
using namespace std;
#include<string>
template<class T>
class Myarry
{
public:
Myarry() {};//自己创建有参构造，编译器就不提供无参构造，所以必须自己写一次无参构造，即使是空实现也要写！
Myarry(int capacity)//有参构造函数
{
this->capacity = capacity;
this->size = 0;
this->marry = new T[this->capacity];//把数组创建在堆区
}
~Myarry()//析构函数
{
if (this->marry !=NULL)
{
delete []this->marry;//析构数组必须加[]，否则会引发断点
marry = NULL;
this->capacity = 0;
this->size = 0;
}
}
Myarry(const Myarry& arr)//拷贝构造
{
this->capacity = arr.capacity;
this->size = arr.size;
this->marry = new T[arr.capacity];
for (int i = 0; i < arr.size; i++)//把数据拷贝过来
{
this->marry[i] = arr->marry[i];
}
}
//等号赋值
Myarry& operator=(const Myarry& arr)
{
if (this->marry != NULL)//如果有数据先清空，再赋值
{
delete[]this->marry;
this->marry = NULL;
this->size = 0;
this->capacity = 0;
}
this->capacity = arr.capacity;
this->size = arr.size;
this->marry = new T[this->capacity];
for (int i = 0; i < this->size; i++)//将数据进行拷贝
{
this->marry[i] = arr.marry[i];
}
return *this;
}
void pushback(const T&ptr)//尾加法
{
if (this->capacity == this->size)
{
cout << "容量已满！" << endl;
return;
}
this->marry[this->size] = ptr;
this->size++;
}
void deleteback()//尾删法
{
if (this->size == 0)
{
cout << "数据为零，没有可删数据！" << endl;
}
delete this->marry[this->size - 1];
this->size--;
}
T & operator[](int index)//通过下标访问数组,并使它作为左值加&
{
if (index > this->capacity)
{
cout << "访问越界！" << endl;
exit(0);
}
return this->marry[index];
}
int gercapacity()//获取数组容量
{
return this->capacity;
}
int getsize()//获取数组元素个数
{
return this->size;
}
private:
T * marry;//数组
int capacity;//数组容量
int size;//数组元素个数
};