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/**
** Objiter.h - Game objects iterator.
**
** Written: 7/29/2000 - JSF
**/
/*
Copyright (C) 2000 Jeffrey S. Freedman
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef INCL_OBJITER
#define INCL_OBJITER 1
#include "objlist.h"
class Map_chunk;
class Game_object;
/*
* Want to make all object iterators modification-safe. For now, just
* trying to detect modification during iteration.
*/
template<class T>
class T_Safe_object_iterator
{
T_Object_list<T>& list;
public:
T_Safe_object_iterator(T_Object_list<T>& l) : list(l)
{ list.add_iterator(); }
~T_Safe_object_iterator()
{ list.remove_iterator(); }
};
/*
* Iterate through list of objects.
*/
template<class T>
class T_Object_iterator : public T_Safe_object_iterator<T>
{
protected:
T first;
T stop;
T cur; // Next to return.
public:
void reset()
{ cur = first; stop = 0; }
T_Object_iterator(T_Object_list<T>& objects)
: T_Safe_object_iterator<T>(objects), first(objects.get_first())
{ reset(); }
T get_next()
{
if (cur == stop)
return 0;
T ret = cur;
cur = cur->next;
stop = first;
return ret;
}
};
typedef T_Object_iterator<Game_object *> Object_iterator;
/*
* Iterate through a chunk's nonflat objects.
*/
template<class T, class L>
class T_Nonflat_object_iterator : public T_Object_iterator<T>
{
T nonflats;
public:
void reset()
{ cur = nonflats; stop = 0; }
T_Nonflat_object_iterator(L chunk)
: T_Object_iterator<T>(chunk->get_objects()), nonflats(chunk->get_first_nonflat())
{ reset(); }
};
typedef T_Nonflat_object_iterator<Game_object *, Map_chunk *> Nonflat_object_iterator;
/*
* Iterate through a chunk's flat objects.
*/
template<class T, class L>
class T_Flat_object_iterator : public T_Safe_object_iterator<T>
{
T first;
T stop;
T cur; // Next to return.
T stop_at;
public:
void reset()
{ cur = first; stop = 0; }
T_Flat_object_iterator(L chunk)
: T_Safe_object_iterator<T>(chunk->get_objects())
{
first = chunk->get_objects().get_first() == chunk->get_first_nonflat() ? 0 :
chunk->get_objects().get_first();
stop_at = chunk->get_first_nonflat() ? chunk->get_first_nonflat()
: chunk->get_objects().get_first();
reset();
}
T get_next()
{
if (cur == stop)
return 0;
T ret = cur;
cur = cur->get_next();
stop = stop_at;
return ret;
}
};
typedef T_Flat_object_iterator<Game_object *, Map_chunk *> Flat_object_iterator;
/*
* Iterate backwards through list of objects.
*/
template<class T, class L>
class T_Object_iterator_backwards : public T_Safe_object_iterator<T>
{
T first;
T stop;
T cur; // Return prev. to this.
public:
void reset()
{ cur = first; stop = 0; }
T_Object_iterator_backwards(L chunk)
: T_Safe_object_iterator<T>(chunk->get_objects()),
first(chunk->get_objects().get_first())
{ reset(); }
T get_next()
{
if (cur == stop)
return 0;
cur = cur->prev;
stop = first;
return cur;
}
};
typedef T_Object_iterator_backwards<Game_object *, Map_chunk *> Object_iterator_backwards;
#endif
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