Re: [boost] [GTL] - geometric template library - determininginterest

From: John Femiani (JOHN.FEMIANI_at_[hidden])
Date: 2007-10-08 01:47:33

> -----Original Message-----
> From: boost-bounces_at_[hidden]
[mailto:boost-bounces_at_[hidden]]
> On Behalf Of Simonson, Lucanus J
> Sent: Sunday, October 07, 2007 2:01 PM
> To: boost_at_[hidden]
> Subject: Re: [boost] [GTL] - geometric template library -
> determininginterest
> 
> Marco wrote:
> >For what I can understand you have one class 'b' in B library that
you
> >want to use with alghoritms of _both_ A and B library the pattern is:
> >
> >1 - get the class 'a' subclassing 'b';     class a : b
> >2 - add to 'a' interfaces to deal with algorithms of library A
> >3 - implement that interfaces using methods of 'b' and/or functions
of
> >library B acting on 'b'
> >4 - use 'a' with library A using the above interface
> >5 - use 'a' with library B because base class of 'a' is a 'b'
> >Is this interpretation correct ?
> 
> Yes, though I would add that the intention is to use it with classes
b1
> through bN of libraries B1 through BN so that the effort of making the
> library generic is worthwhile.  Class a inherits from each of the
> classes b1 through bN through its template parameter.  In this way it
is
> as useful as making class a the common base class of b1 through bN,
but
> is not intrusive and leaves the code of libraries B1 through BN
> untouched.  This inheriting one class from many allows us to unify the
> disparate semantics of many different types that are conceptually
> similar.  I have found it very useful in my day to day work since I
end
> up being the person integrating my library into existing code bases in
> addition to authoring it.
> 
> Lucanus Simonson
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So the "concept" is also an "adapter"?  
Wouldn't it make sense to break things down differently; The concepts
should lay down the minimal syntax requirements for your own library.
You can then provide any number of adapters to and from any other
library in order to satisfy your concepts.  Asking your 'concept' to be
an adapter seems like it may get confusing. 

-- John