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Groups > comp.lang.postscript > #1633

Re: [] [] eq apparently returns true

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On Thursday, September 19, 2013 2:28:21 AM UTC-5, Mark Carroll wrote:
> luser- -droog <mijoryx@yahoo.com> writes:
> 
> 
> 
> > On Wednesday, September 18, 2013 9:50:59 PM UTC-5, Scott Hemphill wrote:
> 
> (snip)
> 
> >> Because empty arrays don't use any VM.  The pointer into the VM is null.
> 
> >
> 
> > Dammit! Mine prints 'false'. :(
> 
> 
> 
> I wonder if the language spec make a guarantee either way. Have you run
> 
> into any other interpreter issues where you were surprised to get some
> 
> latitude on which way to jump?
> 

Yes, indeed. This program is all the little examples verbatim
from the first edition Red Book (PLRM 1ed, checking that each
command produces the correct output from the manual.

http://code.google.com/p/xpost/source/browse/test.ps

There were lots of surprises for me. Particularly in the behavior
of simple things like `round`, where the obvious library function
was not the correct result. And names and strings comparing equal.

And a big one was making integer and reals equivalent as dictionary keys.
That one I haven't found in the manual, but ghostscript does it. :)

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[] [] eq apparently returns true anavi8r@gmail.com - 2013-09-18 10:16 -0700
  Re: [] [] eq apparently returns true Scott Hemphill <hemphill@hemphills.net> - 2013-09-18 22:50 -0400
    Re: [] [] eq apparently returns true luser- -droog <mijoryx@yahoo.com> - 2013-09-18 22:28 -0700
      Re: [] [] eq apparently returns true luser- -droog <mijoryx@yahoo.com> - 2013-09-18 22:35 -0700
      Re: [] [] eq apparently returns true Mark Carroll <mtbc@bcs.org> - 2013-09-19 08:28 +0100
        Re: [] [] eq apparently returns true luser- -droog <mijoryx@yahoo.com> - 2013-09-19 02:06 -0700
          Re: [] [] eq apparently returns true luser- -droog <mijoryx@yahoo.com> - 2013-09-19 02:25 -0700
        Re: [] [] eq apparently returns true luser- -droog <mijoryx@yahoo.com> - 2013-09-19 02:38 -0700
    Re: [] [] eq apparently returns true anavi8r@gmail.com - 2013-09-21 11:28 -0700
      Re: [] [] eq apparently returns true luser- -droog <mijoryx@yahoo.com> - 2013-09-21 12:30 -0700
        Re: [] [] eq apparently returns true Scott Hemphill <hemphill@hemphills.net> - 2013-09-23 23:24 -0400

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