Re: [boost] [optional] memory use for optional refs and ptrs

Subject: Re: [boost] [optional] memory use for optional refs and ptrs
From: David Abrahams (dave_at_[hidden])
Date: 2010-10-07 07:36:26

At Wed, 06 Oct 2010 20:31:30 +0200,
Rutger ter Borg wrote:
> 
> > Optional models "the variable is not set."  You want something
> > different.  Why not just create a different class to model what you
> > want?
> 
> I think I know what optional models, and it is clearly what I want. 
> However, I would like to have space-efficient ones.

It seems clear to me that optional<T*> models one more state than you
want.  You're not interested in "no T*" and "a null T*" as separate
states.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com