《Essential C++》系列笔记之第四章(基于对象的编程风格)之第十节(重载iostream运算符)

代码实践

• main.cpp

  #include 
  using namespace std;
  #include "Person.h"
  
  int main()
  {
  	Person P("HMJ", 12, 12345);
  	cout << P << endl;
  	cin >> P;
  	cout << P << endl;
  
  	system("pause");
  	return 0;
  }
  

• Person.h

  #pragma once
  #include 
  using namespace std;
  #include 
  
  class Person
  {
  	friend istream& operator>>(istream&, Person&);
  	friend ostream& operator<<(ostream&, const Person&);
  public:
  	Person(string name, int age, int tel)
  		:_name(name), _age(age), _tel(tel)
  	{}
  
  	void display();
  
  private:
  	string _name;
  	int _age;
  	int _tel;
  };
  
  //需要明确地是这里什么时候应该加const
  
  ostream& operator<<(ostream&, const Person&); 
  
  istream& operator>>(istream&, Person&);
  

• Person.cpp

  #include "Person.h"
  
  ostream& operator<<(ostream& out, const Person& per)
  {
  	out << per._name << ' '
  		<< per._age << ' '
  		<< per._tel;
  	return out;
  }
  
  istream& operator>>(istream& in, Person& per)
  {
  	in >> per._name
  		>> per._age
  		>> per._tel;
  	return in;
  }
  
  inline void Person::display()
  {
  	cout << this->_name << endl;
  	cout << this->_age << endl;
  	cout << this->_tel << endl;
  }
  

今天还是20200326 还是可以,终于把慕课刷完了