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From: David Thompson <dave.thompson2@verizon.net>
Newsgroups: comp.lang.ada
Subject: Re: Fun with C
Date: Thu, 28 Apr 2011 01:13:27 -0400
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Date: 2011-04-28T01:13:27-04:00
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On Thu, 21 Apr 2011 15:27:40 -0400, Hyman Rosen <hyrosen@mail.com>
wrote:

> On 4/21/2011 2:58 PM, Georg Bauhaus wrote:
> > Suppose you could do the following in C. I trust that
> > C programmers would find this really cool:
> >
> > #include <stdint.h>
> >
> > enum Color {Red, Green, Blue};
> > typedef uint8_t rgb_intensity;
> >
> > int main(void)
> > {
> > rgb_intensity things[enum Color]; // This Here
> > return 0;
> > }
> 
> That doesn't work for C because a variable of an enum type
> may hold any integer value up to the number of bits taken

s/up to/up to at least/

> by the largest enumerator (with a variation for negatives
> that isn't important here). The C enum concept is meant to
> encompass literals used as bit masks as well as singular
> values.

However, for the many C enums that are just sequential integers -- 
the default -- you can do this:

enum Color { Red,Green,Blue, Color_BOUND };

some_t array [Color_BOUND]; // Red..Blue are valid subscripts

This helps *some* especially in maintenance.