类的拷贝构造函数和等号(=)重载符

版权声明：请注明转发出处 https://blog.csdn.net/mafucun1988/article/details/89597321

创建类的时候，对于有指针的成员变量，一定要添加拷贝构造函数和等号(=)重载符。否则进行的是指针指向复制，也就是浅拷贝，类销毁时会重复销毁，造成软件crash。
1. 创建teacher类
2. 添加拷贝构造函数（深拷贝）
3. 添加等号(=)重载符

class Teacher{
public:
	Teacher(char* name,int age){
		
		int len = strlen(name) + 1;
		this->name = new char[len];  //在堆分配内存
		strcpy(this->name,name);

		this->age = age;
	}


	//拷贝构造
	Teacher(const Teacher& t){	
		int len = strlen(t.name) + 1;
		this->name = new char[len];
		strcpy(this->name, t.name);

		this->age = t.age;
	}

	//重载=
	Teacher& operator=(Teacher& t){

		int len = strlen(t.name) + 1;
		if (this->name != NULL){
			delete[] this->name;
		}
		this->name = new char[len];
		strcpy(this->name, t.name);

		this->age = t.age;

		return *this;
	}

	~Teacher(){
		if (this->name != NULL){
			delete[] this->name;
		}
		this->age = 0;
	}


	char* name;
	int age;
};