Design Patterns discussion

["Clint Shank" <clintshank AT hotmail.com>]

Right.

Also, in State, the dependencies are all tangled.  States know about other 
States.  They know how to transition to other States.  They set the next 
State on the Context object.  Sometimes the State base class knows about its 
subclasses.  This is not the case in Strategy.

Another difference is that Strategy does the algorithmic work, whereas, in 
State, a State object usually just calls back to the Context to do the work.


Clint Shank


> From: Robert Allan Schwartz 
> <robertallanschwartz AT yahoo.com>
> Reply-To: 
> notbob AT tessellation.com
> To: "Freeman-Hargis, James" <jfreeman AT midwaygames.com>,        
> gang-of-4-patterns AT cs.uiuc.edu
> Subject: Re: [gang-of-4-patterns] Pattern question: state vs. strategy
> Date: Wed, 6 Jul 2005 10:54:03 -0700 (PDT)
>
> One difference is that the Strategy is visible to (and configurable by) the 
> Client, whereas the
> fact that a class has State is not visible to the Client.
>
> Robert
>
> --- "Freeman-Hargis, James" 
> <jfreeman AT midwaygames.com>
>  wrote:
>
> > I'm wondering if you can give me some additional details as to how these
> > are different? Their applicability, purpose and structure seem nearly
> > identical: make the behavior of the context class change dynamically as
> > the state/strategy changes. Both patterns even mentions how they can be
> > tied into the flyweight pattern. The only difference I can readily see
> > is that the state pattern mentions transitions while the strategy does
> > not. Am I missing something?
> >
> >
> >
> > Thank you for your time,
> >
> > -James
> >
> >
> >
> > > _______________________________________________
> > gang-of-4-patterns mailing list
> > 
> gang-of-4-patterns AT cs.uiuc.edu
> > http://mail.cs.uiuc.edu/mailman/listinfo/gang-of-4-patterns
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
> _______________________________________________
> gang-of-4-patterns mailing list
> gang-of-4-patterns AT cs.uiuc.edu
> http://mail.cs.uiuc.edu/mailman/listinfo/gang-of-4-patterns