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From: ankle@ics.uci.edu (Rod Shankle)
Newsgroups: comp.lang.eiffel
Subject: Re: a < b < c
Summary: Functions are functions
Message-ID: <1989Aug31.191822.20895@paris.ics.uci.edu>
Date: 31 Aug 89 19:18:22 GMT
References: <239@enea.se> <16213@watdragon.waterloo.edu>
Sender: Stefan HM Ludwig
Reply-To: Rod Shankle <ankle@ics.uci.edu>
Organization: University of California, Irvine - Dept of ICS
Lines: 13

> should a < b < f () be allowed and if a >= b should the function be 
> called or not ??

Well, since f () is a function and functions shouldn't have any side
effects (refer to OOSC for a lot of examples and reasons why they shouldn't)
it doesn't matter (unless your profiling the program) if f () gets called
or not.
With that restriction even an expression such as a < f () < c should be
allowed.
BTW, most compilers evaluate IF a < b AND b < c THEN as
	IF a >= b THEN FALSE ELSE b < c

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