c++运算符重载

作用：实现两个自定义类型相加
对于内置数据类型，编译器知道如何进行运算

class Person
{
	
public:

  Person operator+ (Person &p)
  {
	  Person temp;
	  temp.m_a=this->m_a+p.m_a;
	  temp.m_b=this->m_b+p.m_b;
	  return temp;
  }
  
     
  int m_a;
  int m_b;
	
}

Person operator+ (Person &p1,Person &p2)
  {
	  Person temp;
	  temp.m_a=p1.m_a+p2.m_a;
	  temp.m_b=p1.m_b+p2.m_b;
	  return temp;
  }

Person p3=p1+p2;
//成员函数重载本质调佣
Person p3=p1.operator+(p2);
//全局函数重载 本质调用
Person p3=operator+(p1,p2);


赋值运算符重载

class Person
{
	
	public:
	Person(int age)
	{
		m_age=new int(age);
	}
	~Person()
	{
		if(m_age!=NULL)
		{
			delete m_age;
			m_age=NULL;
		}
	}
	int *m_age;
}

Person p1(18);
Person p2(20);
p2=p1;//赋值操作

//重载 赋值运算符
void operator=(Person &p)
{
	//编译器是提供浅拷贝
	//m_age=p.m_age；
	
	//应该先判断是否有属性在堆里，如果有先释放干净，再深拷贝
	if（m_age!=NULL）
	{
		delete m_age;
		m_age=NULL;
	}
	//深拷贝 
	m_age=new int(*p.m_age);
	
}

void operator==(Person &p)
{
	if(this->m_name==p.m_name && this->m_age == p.m_age)
	{
		return true;
	}
	return false;
}