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Re: Calculations while sorting?

From: John Darrington
Subject: Re: Calculations while sorting?
Date: Wed, 6 Aug 2008 09:09:55 +0800
User-agent: Mutt/1.5.13 (2006-08-11)

On Tue, Aug 05, 2008 at 10:09:36AM -0700, Ben Pfaff wrote:
     John Darrington <address@hidden> writes:
     > I suppose this is one way of doing it, but it exposes (what I have in
     > the past considered to be) casereader internals, and I'm not convinced
     > that it's easier (from the point of view of the person writing
     > procedures).  
     For what it's worth, I have never intended that any of the
     functions used there be considered internal to the casereader or
     sorting code.  In particular, sort_execute() is only really meant
     as a convenience function for a common case.
     > My idea would have done the above with something similar to:
     >  const int n_stats = 3;
     >  struct statistics stats[n_stats];
     >  stats[0] = foo_create ();
     >  stats[1] = bar_create ();
     >  stats[2] = moments_create ();
     >  output  = sort_execute (statistics_reader_create (input, stats, 
     > It just needs a very general purpose casereader/translator which is
     > created with the function
     >  struct casereader *
     >  statistics_reader_create (struct casereader *, struct statistics *, 
     As I said, I don't see anything wrong with that.  Your code does
     look a little simpler than mine, I admit.  It would be easy to
     implement it in terms of casereader_translator.  Do you want me
     to build something like that, or do you feel comfortable writing
     it yourself?

I'm happy to give it a go.


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