C#

class Population{
       public void DuplicatePopulation(Population thatPop){
         x=thatPop.x;
       }
       public int x;
};
class GA{
public GA(){
       InitPop=new Population();
       CrossOverPop=new Population();
}
public Population FindPopID(int ID){
       switch(ID){
         case 1:return InitalPop;break;
	 case 2:return CrossOverPop;break;
	 default:break;
       }
       return InitialPop;//default
}
public void DuplicatePopulation(int FromID,int ToID){
	Population FROM,TO;
	FROM=FindPopID(FromID);
	TO=FindPopID(ToID);		         
        TO.DuplicatePopulation(FROM);
}
Population InitialPop,CrossOverPop;
};

class MainClass{
public void main(string[] args){
        GA GeneticAl=new GA();
        
        //Process here

        GeneticAl.DuplicatePopulation(1,2);
};