struct State
{
   enum { Game, /*...*/ } mode;

   struct
   {
      bool drawMinimap;
   } game;
} State;

// -----------------------

class BaseScene
{
   virtual void update();
   virtual void draw();
};

class Minimap : BaseScene
{
}

class Game : Basescene
{
   Minimap * minimap;

   void draw()
   {
     if(state.game.drawMinimap)
       minimap->draw();
   }
}

// -----------------------

class Application
{
   Game  * game;

   void run()
   {
      while(...)
      {
         events();
         update();
         render();
      }
   }

   void render()
   {
      switch(state.mode)
      {
         case State::Game:
            game->draw();

            break;

         //...
      }
   }
}