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Re: Adding an interface to existing classes

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Date Mon, 26 Dec 2011 00:37:22 +1100
Subject Re: Adding an interface to existing classes
From Chris Angelico <rosuav@gmail.com>
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On Mon, Dec 26, 2011 at 12:27 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> There's nothing in the above that assumes that other has the same type as
> self. It's just that the type of other is ignored, and the type of self
> always wins. I find that a nice, clear rule: x.intersection(y) always
> returns a point with the same type as x.

The intersection of DrawableLine and DrawableLine is DrawablePoint.
That's not the same type as either of the inputs. Same if you seek the
intersection of two planes, which is a line - or two spheres, which is
a circle (with possible failure if they don't intersect).

ChrisA

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Thread

Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2011-12-22 00:21 -0800
  Re: Adding an interface to existing classes Terry Reedy <tjreedy@udel.edu> - 2011-12-22 18:13 -0500
    Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2011-12-24 15:49 -0800
      Re: Adding an interface to existing classes Terry Reedy <tjreedy@udel.edu> - 2011-12-24 20:58 -0500
        Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2012-01-04 23:55 -0800
  Re: Adding an interface to existing classes Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-24 18:16 -0700
    Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2012-01-04 23:54 -0800
  Re: Adding an interface to existing classes Rick Johnson <rantingrickjohnson@gmail.com> - 2011-12-24 17:24 -0800
    Re: Adding an interface to existing classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 12:10 +0000
      Re: Adding an interface to existing classes Chris Angelico <rosuav@gmail.com> - 2011-12-25 23:32 +1100
        Re: Adding an interface to existing classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 13:27 +0000
          Re: Adding an interface to existing classes Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:37 +1100
            Re: Adding an interface to existing classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 13:46 +0000
              Re: Adding an interface to existing classes Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:55 +1100
              Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2012-01-04 23:56 -0800

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