treewars/gamestate.h

/* Abstract instance of a game state.
   This contains the basic functions for game looping code,
   and has a fully-functional event handler we can overload later
 */

#ifndef _GAME_STATE_H_
#define _GAME_STATE_H_

#include "mainevent.h"
#include <SDL.h>
#include <exception>
#include <stack>

using std::exception;
using std::stack;

class StateExit : public exception {};

class GameState : public MainEvent
{
 public:
    GameState(stack<GameState*>* state_stack, SDL_Surface* display)
	{ this->state_stack = state_stack, this->display = display; }
    virtual ~GameState() {}

    virtual bool init() = 0;
    void execute() throw(StateExit);

  protected:
    virtual void iterate() = 0;
    virtual void render() = 0;
    
    void on_exit();

    stack<GameState*>* state_stack;
    SDL_Surface* display;
};


#endif