Path: utzoo!attcan!uunet!lll-winken!csd4.milw.wisc.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpfcdc!mike
From: mike@hpfcdc.HP.COM (Mike McNelly)
Newsgroups: comp.lang.c
Subject: Re: How to do sets?
Message-ID: <5080031@hpfcdc.HP.COM>
Date: 17 Mar 89 16:43:07 GMT
References: <518taylorj@yvax.byu.edu>
Organization: HP Ft. Collins, Co.
Lines: 23

> This may be a dumb question, but I haven't been able to find anyone yet who
> could answer it...

> Is there a way to do sets in C (like in Pascal)?  That is, check for set
> inclusion (char in ["0".."9"]), and perform unions and intersections.  And the
> answer is not "use bitwise operators," I already know how to do that and would
> rather not if there's an easier way, especially with large sets requiring 32
> bytes or more.

> Thanks.

No set operations are inherent in the C language. It's easy enough, however,
to write a library with routines to 
	1) create a set of a specified size
	2) manipulate the set (e.g. intersection)
	3) free a set
That's precisely how set operations are implemented in languages such as 
Pascal.

Sorry, I can't provide such a library since it's part of our proprietary
software.

Mike McNelly	mike%hpfcla@hplabs.hp.com