Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.lang.c
Subject: Re: 'C' enum syntax problem
Keywords: enum syntax
Message-ID: <1503@auspex.auspex.com>
Date: 25 Apr 89 18:23:11 GMT
References: <1095@cvbnet2.UUCP>
Reply-To: guy@auspex.auspex.com (Guy Harris)
Distribution: usa
Organization: Auspex Systems, Santa Clara
Lines: 47

>Does it mean that subsets of an enum cannot be defined ?

It means that the names of enumeration members are global, not local to
the "enum" in which they're used; this means that you can't have the
same "enum" name belong to two different enumerations (at least not with
different values) within the same scope.

Since C has no notion of a subrange type, and since you seem to be
trying to create a subrange type of WEEK, the answer is basically "no,
subranges of an enum cannot be defined."

>Is this a bug in my C Compiler ?

No.  It is doing the correct thing.

>What does PAns say about this ?

	3.5.2.2 Enumeration specifiers

	...

	Semantics

	   The identifiers in an enumerator list are declared as
	constants that have type "int" and may apper wherever such are
		  58
	permitted.

	...

	58.  Thus, the identifiers of enumeration constants declared in
	     the same scope shall all be distinct from each other and
	     from other identifiers declared in ordinary declarators.

>Is there a work around ?

	typedef enum WEEK {
		WEEK_MONDAY, WEEK_TUESDAY, WEEK_WEDNESDAY,
		WEEK_THURSDAY, WEEK_FRIDAY,
		WEEK_SATURDAY, WEEK_SUNDAY
	};

	typedef enum WEEK_END {
		WEEK_END_SATURDAY, WEEK_END_SUNDAY
	};

is one possibility.