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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Saturation arithmetic woes.
Date: Wed, 29 Jul 2009 11:14:34 -0700
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Date: 2009-07-29T11:14:34-07:00
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xorque wrote:
> generic
>   type Discrete_Type is (<>);

This may be any discrete type, including an enumeration type. Arithmetic is not 
defined for enumeration types, so you do not automatically get "+" for this. You 
either need to explicitly require a "+" function ("with function "+" ...), or 
use a generic formal type that does include "+": "is range <>" or "is mod <>".

-- 
Jeff Carter
"What I wouldn't give for a large sock with horse manure in it."
Annie Hall
42