C++ struct iteration

class InvaderClass
{
public:
	struct invader{
		short int x;
		short int y;
		int last_fired;
		short int score;
	};

	struct invader_bullet{
		short int x;
		short int y;
		short int speed;
	};

	const short int initial_invader_speed;

	short int invader_speed_base;
	short int invader_speed;
	short int mothership_speed;

	const short int initial_invader_bullet_speed;

	short int invader_bullet_speed_base;

	void MoveInvaders(){
	// Moves all existing invaders
		invader invaderinstance;
		MoveInvaderInstance(invaderinstance)
	}
};

	Function MoveInvaders()
	; Moves all existing invaders
		For invaderinstance.invader = Each invader
		 MoveInvaderInstance(invaderinstance.invader)
Next
End Function

#include <list>
using namespace std;

Class Invader{
public:
   Invader(){
   }

   void Update(){
      //blah...
   }
};

list<Invader*> invaders;

void CreateInvaders( int count ){
   for( int i=0;i<count;++i ){
      invaders.push_back( new Invader );
   }
}

void DestroyAllInvaders(){
   while( !invaders.empty() ){
      delete invaders.back();
      invaders.pop_back();
   }
}

void UpdateInvaders(){
   for( list<Invader>::iterator it=invaders.begin();it!=invaders.end(); ){
      Invader *invader=*it;

      invader->Update();

      if( invader->WantsToBeRemoved() ){
         it=invaders.erase( it );
      }else{
         ++it;
      }
   }
}

namespace SpaceInvaders{

   class Invader{
   };

   class Player{
   };

   class Missile{
   };

   class Bullet{
   };

   void CreateInvaders( int count ){
   }

   void UpdateInvaders(){
   }
   ...etc...
}