Re: Enumerations

[warlord!gelac!celliott@gatech.edu (Chris Elliott)]

In article <9209162110.AA21397@efftoo.boeing.com> crispen@efftoo.boeing.com (cr
ispen) writes:
>But what I'd like to know is, does anyone know of an Ada compiler
>which does not give a machine value of zero for the first element of
>an enumeration, one for the second, and so on?
>
>Just idle curiosity, actually, since it came up in the context of a
>document I'm writing that's going to say, "Use rep specs for interface
>objects and don't trust different compilers to do the same thing".



I don't think the LRM defines the starting machine representation
of an enumeration type.  The position of that type is defined to
start at zero in 3.5.1, even if you use a representation clause.
However the position is not necessarily the same as the machine
representation.  To sum up:  If it ain't in the LRM, don't count
on it.

-Chris Elliott   celliott@gelac.lockheed.com

-- 
Chris Elliott - celliott@gelac.lockheed.com