Effective C++读书笔记之十二：复制对象时勿忘其每一个成分

class Date{...};
class Customer
{
public:
	...
private:
	std::string name;
	Date lastTransaction;
};

class PriorityCustomer:public Customer
{
public:
	PriorityCustomer(const PriorityCustomer& rhs);
	PriorityCustomer& operator=(const PriorityCustomer& rhs);
	...
private:
	int priority;
}:

PriorityCustomer::PriorityCustomer(const PriorityCustomer& rhs)
:Customer(rhs),priority(rhs.priority)  //调用base class的copy构造函数
{}

PriorityCustomer& PriorityCustomer::operator = (const PriorityCustomer& rhs)
{
	Customer::operator=(rhs);  //对base class成分进行赋值动作
	priority=rhs.priority;
	return *this;
}