#include <algorithm>
#include <iostream>
#include <vector>
#include <set>
#include <string>
using namespace std;

template <class Type>
class MultValue
{
private:
	Type Factor;   // The value to multiply by
public:

	// Constructor initializes the value to multiply by
	MultValue ( const Type& _Val ) : Factor ( _Val ) {
	}

	// The function call for the element to be multiplied
	int operator ( ) ( Type& elem ) const 
	{
		return elem * Factor;
	}
};


class Person{
public:
   string f, l;
   int age;
   Person():f(""),l(""),age(0){}
   Person(string fn, string ln, int a):f(fn),l(ln),age(a){}
};
   bool operator <(const Person &p, const Person &q){
	   return p.age < q.age;
   }


class Age
{
public:

	// The function call for the element to be multiplied
	Person& operator ( ) ( Person & p ) const 
	{
		p.age++;
		return  p;
	}
};


void main(){

	vector<int> v;
	for(int i = 0; i < 10; i++)
		v.push_back(i);
	for(int i = 0; i < 10; i++)
		cout << v[i] << endl;	
	transform(v.begin(),v.end(), v.begin(), MultValue<int>(3));
	cout << "Transformed " << endl;
	for(int i = 0; i < 10; i++)
		cout << v[i] << endl;	
    Person bill("Bill", "Wilson", 42);
	Person sue("Sue", "Smith", 44);
	set< Person> s;
	s.insert(bill);
	s.insert(sue);
    transform(s.begin(), s.end(), s.begin(), Age());
	set<Person>::iterator it;
	for(it = s.begin(); it != s.end(); it++)
		cout << (*it).f << (*it).l << (*it).age << endl;
}