60 C++ - 类模板的应用

#pragma once
template<class T>
class MyArray
{
public:
  explicit MyArray(int capacity)
  {
    this->m_Capacity = capacity;
    this->m_Size = 0;
    // 如果T是对象，那么这个对象必须提供默认的构造函数
    pAddress = new T[this->m_Capacity];
  }
  //拷贝构造
  MyArray(const MyArray & arr)
  {
    this->m_Capacity = arr.m_Capacity;
    this->m_Size = arr.m_Size;
    this->pAddress = new T[this->m_Capacity];
    for (int i = 0; i < this->m_Size;i++)
    {
      this->pAddress[i] = arr.pAddress[i];
    }
  }
  //重载[] 操作符  arr[0]
  T& operator [](int index)
  {
    return this->pAddress[index]; 
  }
  //尾插法
  void Push_back(const T & val)
  {
    if (this->m_Capacity == this->m_Size)
    {
      return;
    }
    this->pAddress[this->m_Size] = val;
    this->m_Size++;
  }
  void Pop_back()
  {
    if (this->m_Size == 0)
    {
      return;
    }
    this->m_Size--;
  }
  int getSize()
  {
    return this->m_Size;
  }
  //析构
  ~MyArray()
  {
    if (this->pAddress != NULL)
    {
      delete[] this->pAddress;
      this->pAddress = NULL;
      this->m_Capacity = 0; 
      this->m_Size = 0;
    }
  }
private:
  T * pAddress;  //指向一个堆空间，这个空间存储真正的数据
  int m_Capacity; //容量
  int m_Size;   // 大小
};
测试代码：
class Person{
public:
  Person(){}
  Person(string name, int age){
    this->mName = name;
    this->mAge = age;
  }
public:
  string mName;
  int mAge;
};
void PrintMyArrayInt(MyArray<int>& arr){
  for (int i = 0; i < arr.getSize(); i++){
    cout << arr[i] << " ";
  }
  cout << endl;
}
void PrintMyPerson(MyArray<Person>& personArr)
{
  for (int i = 0; i < personArr.getSize(); i++){
    cout << "姓名：" << personArr[i].mName << " 年龄： " << personArr[i].mAge << endl;
  }
}
  MyArray<int> myArrayInt(10);
  for (int i = 0; i < 9; i++)
  {
    myArrayInt.Push_back(i);
  }
  myArrayInt.Push_back(100);
  PrintMyArrayInt(myArrayInt);
MyArray<Person> myArrayPerson(10);
  Person p1("德玛西亚", 30);
  Person p2("提莫", 20);
  Person p3("孙悟空",18);
  Person p4("赵信", 15);
  Person p5("赵云", 24);
  myArrayPerson.Push_back(p1);
  myArrayPerson.Push_back(p2);
  myArrayPerson.Push_back(p3);
  myArrayPerson.Push_back(p4);
  myArrayPerson.Push_back(p5);