Re: [Boost-users] Dynamically creating new units

Subject: Re: [Boost-users] Dynamically creating new units
From: Ray Burkholder (ray_at_[hidden])
Date: 2009-12-25 21:25:55

> 
> Ah, but you can, depends on how you can abstract your system.  Think
> of how C works with void pointers and such and you can start to see
> patterns for your classes.  Think of this.
> 

<snip>

> And the implementation is in a cpp file, but now everything that uses
> this has to include all the nasty and slow instancing for the
> someSuperHeavyTemplate<int> type.  Now think of this in a C way...
> class myStuff;

<snip>

> 
> And the implementation contains the implementation of myStuff and the
> function definitions.  Only that cpp file includes the heavy template
> instancing, and all other accesses are fast.  You can only do this on
> classes/struct that you normally use as pointers in the first place,
> but if you can then you can see how you can vastly simplify access to
> only what is needed in the public interface, rather then *everything*
> that is in the interface.
> 

I think this falls under the PIMPL idiom, which is described by Herb Sutter at:

http://www.gotw.ca/publications/mill04.htm
http://www.gotw.ca/publications/mill05.htm

with more generically useful articles at:

http://www.gotw.ca/publications/index.htm

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