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Author mark.dickinson
Recipients amaury.forgeotdarc, eric.smith, mark.dickinson, pitrou, rhettinger, stutzbach
Date 2010-10-07.21:04:01
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Message-id <1286485442.93.0.345929097918.issue10044@psf.upfronthosting.co.za>
In-reply-to
Content 
> I can't say anything about the standard, but p > q looks like it should
> be the same as (p - q) > 0

Yep.

> which looks rather well-defined for pointers.

Nope.  It's only well-defined for pointers pointing into the same array (or to one past the end of an array).  Otherwise it's undefined behaviour.

See section 6.5.6, paragraph 9, of

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf
History
Date User Action Args
2010-10-07 21:04:03mark.dickinsonsetrecipients: + mark.dickinson, rhettinger, amaury.forgeotdarc, pitrou, eric.smith, stutzbach
2010-10-07 21:04:02mark.dickinsonsetmessageid: <1286485442.93.0.345929097918.issue10044@psf.upfronthosting.co.za>
2010-10-07 21:04:01mark.dickinsonlinkissue10044 messages
2010-10-07 21:04:01mark.dickinsoncreate