Credits: BS, OGC

An entity is represented by a struct, after its creation, a vector of the type of the struct is created to contain some entities.

Code:
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
//
// UTN FRGP TSP
// BS
// mail: david_bs@live.com
// web: Etalking.Com.Ar
// 2012
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#include <windows.h>
#include <stdio.h>

#include <fstream.h>
#include <string>
#include <vector>

using namespace std;

typedef struct estructura_s{
	int a;
	int b;
	int c;
}estructura_t;

struct ent_info{ 
	estructura_s* ent;
};

vector<ent_info> vEntidad;
Add and erase entities, also list them
Code:
void AgregarEntidad(struct estructura_s* ent)
{
	ent_info dummy;
	dummy.ent = ent;
	if(vEntidad.size()<64)
		vEntidad.push_back(dummy);
}

void BorrarVectorDeEntidades()
{
	vEntidad.clear();
}

void ListarItemsDeEntidades(){

	for(unsigned int ab=0; ab<vEntidad.size(); ab++){
	
		cout << "La entidad: " << ab << endl;
		cout << "Item 1: " << vEntidad[ab].ent->a << endl;
		cout << "Item 2: " << vEntidad[ab].ent->b << endl;
		cout << "Item 3: " << vEntidad[ab].ent->c << endl;
	}
}
Code:
int main(){

	BorrarVectorDeEntidades();

	struct estructura_s ent1;
	struct estructura_s ent2;
	struct estructura_s ent3;
	ent1.a=111;
	ent1.b=222;
	ent1.c=333;
	ent2.a=444;
	ent2.b=555;
	ent2.c=666;
	ent3.a=777;
	ent3.b=888;
	ent3.c=999;

	AgregarEntidad(&ent1);
	AgregarEntidad(&ent2);
	AgregarEntidad(&ent3);

	ListarItemsDeEntidades();

	cin.get();
	return 0;
}