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From: diamond@jit345.swstokyo.dec.com (Norman Diamond)
Newsgroups: comp.lang.c
Subject: Re: Number of enums
Message-ID: <1991Jan21.083657.7378@tkou02.enet.dec.com>
Date: 21 Jan 91 08:36:57 GMT
References: <703@caslon.cs.arizona.edu>
Sender: news@tkou02.enet.dec.com (USENET News System)
Reply-To: diamond@jit345.enet@tkou02.enet.dec.com (Norman Diamond)
Organization: Digital Equipment Corporation Japan , Tokyo
Lines: 25

In article <703@caslon.cs.arizona.edu> dave@cs.arizona.edu (Dave P. Schaumann) writes:

>C is lacking (as far as I know) a general way to get the last value of an
>enum type.

Yes.

>For instance, suppose I have:
>typedef enum { SUN, MON, TUE, WED, THU, FRI, SAT } days_t ;
>The best I have come up with is to do this:
>#define last_days_t SAT /* Named as last_ ## <enum type name> */

I use:
typedef enum days_t { SUN, MON, TUE, WED, THU, FRI, SAT, NO_OF_DAYS } days_t;
And make sure that new days are added before NO_OF_DAYS.
If I also need LAST_DAY, I use:
#define LAST_DAY  (NO_OF_DAYS - 1)

I wouldn't make a name like "last_days_t" a constant; the name looks like
a type.  Of course, every type name that I named during the past 11 years
is now in the POSIX reserved name space :-(

--
Norman Diamond       diamond@tkov50.enet.dec.com
If this were the company's opinion, I wouldn't be allowed to post it.