From: Fernando Cacciola (fcacciola_at_[hidden])
Date: 2001-05-09 16:45:55
----- Original Message -----
From: Bill Seymour <bsey_at_[hidden]>
Sent: Wednesday, May 09, 2001 6:12 PM
Subject: Re: [boost] Fixed-Point Decimal Type
> Fernando Cacciola wrote:
> > ... I recommend at least two default variations, one with an
> > efficient internal representation and another with a flexible
> > representation, allowing arbitrary large numbers. Some
> > applicatiosn will need that range flexibility.
> I think I want to write a class that one or more vendors could
> implement as a built-in type under the as-if rule. That's why
> I picked 18 digits (prior art on IBM mainframes, if I remember
> Something that is to the proposed class as vector is to built-in
> array would certainly be useful; but I see that as a separate class.
But as a user I wouldn't consider them so much different.
I would rather see it as I see float and double types.
Both would have the same interface and would be used for the same reason,
only one won't overflow.
At least keep this in mind. I believe that the implementation could be done
in such a way
that the internal representation is actually generalized.
Even if you don't let the user know about that generalization, you could
easly support both variations
with the same base code.
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