Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!ptsfa!lll-lcc!rutgers!dayton!rosevax!rose3!starfire!merlyn
From: merlyn@starfire.UUCP
Newsgroups: comp.lang.c
Subject: enum - enum ?
Message-ID: <139@starfire.UUCP>
Date: Wed, 3-Jun-87 12:31:55 EDT
Article-I.D.: starfire.139
Posted: Wed Jun  3 12:31:55 1987
Date-Received: Sat, 6-Jun-87 11:07:29 EDT
Organization: Starfire Consultings Services, Mpls., MN
Lines: 19

What does the current standard say about enum - enum (both same enum type)?
I have tried this with 2 compilers; one complained about using enums in
an expression (needs cast to int), the other one didn't.

I think it would be reasonable for enum - enum to be an integer value,
just as ptr - ptr is, and for similar reasons; you want the 'distance'
between them.  This would also imply  enum + int  == enum  and  enum++ is ok

Of course, if you do:   enum color {red=99, blue=-4, green=200};
then green-red will be 101, not 2, and red++ != blue, but that's your doing.

I know (int) green - (int) red will always work, but it's ugly.
If enums are too strongly typed (what is this, Pascal?) people will
go back to lists of #defines.

-----
"Oh carrots!  Oh crumbs!"
Merlyn Leroy
	...rutgers!dayton!rosevax!rose3!starfire!merlyn