Collision.h

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#ifndef __COLLISION_H__
#define __COLLISION_H__
#include "fns.h"
#include "WorldObject.h"
#include "CollisionObject.h"
#include <vector>
#include <string>
#include <map>
#include <tuple>

using std::vector;
using std::string;
using std::map;

class Collision
{
public:
        Collision():CollisionLists(), Buckets(), Collisions(), CellHeight(64), CellWidth(64) {}
        ~Collision() { 
                clear();
                delete m_instance; 
        }
        vector< vector< WorldObject* > > CollisionLists;
        vector< map< Point2D, vector< WorldObject* > > > Buckets;
        map< pair< WorldObject*, WorldObject* >, vector< tuple< WorldObject*, CollisionObject*, WorldObject*, CollisionObject* > >* > Collisions;
        unsigned int CellWidth;
        unsigned int CellHeight;
        static Collision* m_instance;

        static Collision* collider() {
                if(!m_instance)
                        m_instance = new Collision;
                return m_instance;
        }

        bool collided(WorldObject* a, WorldObject* b){ return Collisions.find(make_pair(a,b))!=Collisions.end(); }

        bool collided(pair< WorldObject*, WorldObject* > key){ return Collisions.find(key)!=Collisions.end(); }

        void markCollision(WorldObject* a, CollisionObject* ac, WorldObject* b, CollisionObject* bc){ 
                vector< tuple< WorldObject*, CollisionObject*, WorldObject*, CollisionObject* > >* vec;
                pair< WorldObject*, WorldObject* > key = make_pair(a,b);
                if(Collisions.find(make_pair(a,b))!=Collisions.end())
                        vec = new vector< tuple< WorldObject*, CollisionObject*, WorldObject*, CollisionObject* > >(); 
                else 
                        vec = Collisions[key];
                vec->push_back(make_tuple(a, ac, b, bc));
        }

        vector< tuple< WorldObject*, CollisionObject*, WorldObject*, CollisionObject* > >* getCollisions(WorldObject* a, WorldObject* b){
                pair< WorldObject*, WorldObject* > key = make_pair(a,b);
                if(collided(key))
                        return Collisions[key];
                else
                        return NULL;
        }

        void clear(){
                Buckets.clear();
                foritr(val,Collisions)
                        delete val->second;
                Collisions.clear();
        }
};
#endif