[geos-devel] JTS/GEOS performance - smart-ptr vs ref counting

[Chapman, Martin]

Martin,
 
If you look at the smart pointer code I sent you earlier you will see two methods Attach() and Detach() that solve the problems listed in that url by dburns.
 
Martin

	-----Original Message----- 
	From: Martin Davis [mailto:mbdavis at VividSolutions.com] 
	Sent: Mon 1/31/2005 6:50 PM 
	To: GEOS Development List 
	Cc: 
	Subject: RE: [geos-devel] JTS/GEOS performance - smart-ptr vs ref counting
	
	

	Hmmm...    I don't fully understand this scheme, but there seems to be
	some warning on this page about using circular references:
	
	"If circular referencing is possible, it is necessary to carefully use
	simple pointers when it is known that the the object will be referenced
	by another ref_ptr in the current scope. "
	
	Martin Davis, Senior Technical Architect
	Vivid Solutions Inc.      www.vividsolutions.com
	Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
	Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046
	
	
	> -----Original Message-----
	> From: Norman Vine [mailto:nhv at cape.com]
	> Sent: January 31, 2005 5:49 PM
	> To: Martin Davis
	> Subject: RE: [geos-devel] JTS/GEOS performance - smart-ptr vs
	> ref counting
	>
	>
	> This is a reasonable summary
	> http://dburns.dhs.org/OSG/Articles/RefPointers/RefPointers.html
	>
	> > -----Original Message-----
	> > From: Martin Davis [mailto:mbdavis at VividSolutions.com]
	> > Sent: Monday, January 31, 2005 8:37 PM
	> > To: nhv at cape.com
	> > Subject: RE: [geos-devel] JTS/GEOS performance - smart-ptr vs ref
	> > counting
	> >
	> >
	> > Do you have a reference that explains this, Norman?  I
	> always thought
	> > that self-referential structures were the classic case that
	> > ref-counting couldn't handle.  (And when I google
	> "reference counting
	> > self referential" I find an awful lot of web pages that say the same
	> > thing...)
	> >
	> > Martin Davis, Senior Technical Architect
	> > Vivid Solutions Inc.      www.vividsolutions.com
	> > Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
	> > Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046
	> >
	> >
	> > > -----Original Message-----
	> > > From: Norman Vine [mailto:nhv at cape.com]
	> > > Sent: January 31, 2005 4:55 PM
	> > > To: GEOS Development List
	> > > Subject: RE: [geos-devel] JTS/GEOS performance - smart-ptr vs
	> > > ref counting
	> > >
	> > >
	> > > Martin Davis writes:
	> > > >
	> > > > It's just occurred to me that a classic issue with
	> ref-counting is
	> > > > being able to handle self-referential data structures. 
	> Some of the
	> > > > data structures in JTS/GEOS are inherently
	> self-referential (e.g.
	> > > > topology graphs).  Is there a standard pattern for
	> coping with this
	> > > > kind of problem?
	> > >
	> > > The standard method of using ref/smartpointers works just fine :-)
	> > >
	> > > Norman
	> > >
	> > > _______________________________________________
	> > > geos-devel mailing list
	> > > geos-devel at geos.refractions.net
	> > > http://geos.refractions.net/mailman/listinfo/geos-devel
	> > >
	> >
	>
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