Data Oriented Design Entity Component System

#include <iostream>
#include <map>

using namespace std;

typedef unsigned long EntityId;
typedef unsigned int EntityType;

enum {PLAYER, ALIEN, TOWER};

template <typename C> class System
{
public:

    std::map<EntityId, C * > components;
};

class Component
{
    EntityId id;
    EntityType type;

public:
    Component(EntityId pId, EntityType pType) : id(pId), type(pType) {}
    getId()
    {
        return id;
    }
    getType()
    {
        return type;
    }
    void render()
    {
        cout << "---------------------" << endl;
        cout << " - Id   = " << getId() << endl;
        cout << " - Type = " << getType() << endl;
        cout << "---------------------" << endl;
    }

};


class PositionComponent: public Component
{
    int x;
    int y;
    int z;
public:
    PositionComponent(EntityId id, EntityType type) : Component(id, type), x(0), y(0), z(0) {}
    getX(){return x;}
    getY(){return y;}
    getZ(){return z;}
};

class RenderComponent : public Component
{
public:
    RenderComponent(EntityId id, EntityType type) : Component(id, type) {}

};

EntityId uniqId=0;
System<Component> mapComponent;
System<PositionComponent> mapPos;
System<RenderComponent> mapRender;

class EntityManager
{
public:

    static void addEntity (EntityType type, int x, int y, int z)
    {
        uniqId++;
        switch (type)
        {
        case PLAYER:
            mapComponent.components[uniqId] = new Component(uniqId, type);
            mapPos.components[uniqId] = new PositionComponent(uniqId, type);
            mapRender.components[uniqId] = new RenderComponent(uniqId, type);
            break;
        case ALIEN:
            mapComponent.components[uniqId] = new Component(uniqId, type);
            mapPos.components[uniqId] = new PositionComponent(uniqId, type);
            mapRender.components[uniqId] = new RenderComponent(uniqId, type);
            break;
        case TOWER:
            mapComponent.components[uniqId] = new Component(uniqId, type);
            mapPos.components[uniqId] = new PositionComponent(uniqId, type);
            //mapRender.components[uniqId] = new RenderComponent(uniqId, type);
            break;
        default:
            break;

        }
    }

    static void render()
    {
        for (std::map<EntityId, RenderComponent*>::iterator it = mapRender.components.begin(); it != mapRender.components.end(); ++it)
        {
            (*it).second->render();
        }
    }
};

int main()
{

    EntityManager::addEntity(PLAYER, 10,10,0);
    EntityManager::addEntity(ALIEN, 10,10,0);
    EntityManager::addEntity(PLAYER, 10,10,0);
    EntityManager::addEntity(TOWER, 10,10,0);

    EntityManager::render();



    cout << "MugenStudio" << endl;
    return 0;
}