Re: [boost] [xint] Third release is ready, requesting preliminary review

Subject: Re: [boost] [xint] Third release is ready, requesting preliminary review
From: Chad Nelson (chad.thecomfychair_at_[hidden])
Date: 2010-05-03 18:20:01

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On 05/03/2010 03:40 PM, vicente.botet wrote:

>>> You need to mut the minimal part on the derived part, but don't add
>>> to much on the base class.
>>
>> The usual way to do that is via virtual functions. I've been trying to
>> avoid virtual functions in the base_integer class, for efficiency's
>> sake; the intermediary class mentioned below is intended to solve the
>> problem without need of them.
> 
> Chad I need to ask you if you knwo the tecnique we are suggesting 
> you, i.e. CRTP Curious Recurring Template Pattern. If this is not the
> case we could explain you in more detaill how it wan be used to your
> case.

I've looked into it at least twice in the past, but that's one of those
things that I can never seem to remember. Looking it up again... ah, now
I remember why I can never seem to remember it: I've never understood
the purpose of it in the first place, and never seen it used.

Hm... I *think* I see it now. At least, some of the time I think I do.
:-) Please check my understanding: you're suggesting that I use
functions in base_integer to do the allocation, and have them call other
functions in base_integer to do the things that are different between
fixed_integer and the variable-length integers. But then override those
functions in the fixed_integer classes, not as virtual functions, but
using CRTP to call the overridden functions. Am I right?
- -- 
Chad Nelson
Oak Circle Software, Inc.
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