#include <iostream>
#include <sstream>
#include <string>

using namespace std;

class Person
{
public:
  Person(string n, int a)
    : name{n}, age{a}
  {}

  Person& operator++()
  {
    ++age;
    return *this;
  }

  Person operator++(int)
  {
    Person temp{*this};
    ++age;
    return temp;
  }

  bool operator<(Person const& rhs)
  {
    return age < rhs.age;
  }

  friend ostream& operator<<(ostream & lhs, Person const& rhs)
  {
    lhs << "name: " << rhs.name << "\nage: " << rhs.age;
    return lhs;
  }

  
private:
  string name;
  int age;
};


int main()
{
  Person p1{"Pontus", 30};
  Person p2{"Janos", 25};
  
  cout << p1 << endl; //operator<< (ostream, Person) 
  ++p1;               //operator++ ()
  p1++;               //operator++ (int)
  p1 < p2;            //operator< (Person)
}