Re: [boost] [fusion] [intro] ADAPT_STRUCT extensions

Subject: Re: [boost] [fusion] [intro] ADAPT_STRUCT extensions
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2010-07-29 17:48:54

> in the discussion about the library I called "Intro" at the time it has
> been suggested to use BOOST_FUSION_ADAPT_STRUCT of Boost.Fusion for data
> member access.
> 
> based on that I'd like to propose two extensions to ADAPT_STRUCT, which I
> think are useful beyond my use case:
> 
> 1)
> 
> ADAPT_STRUCT can adapt public data members only.
> 
> with the modifications I uploaded here:
> http://svn.boost.org/svn/boost/sandbox/intro/boost/fusion/adapted/struct/
> 
> all data members can be adapted. for example:
> 
> class A{
> private:
>    friend class fusion::access;
>    int a;
> };
> 
> BOOST_FUSION_ADAPT_STRUCT(A,(int,a) )
> 
> 2)
> 
> adaption of a class including its base class members. for example:
> 
> struct A{ int a; };
> struct B{ int b; };
> struct C : A,B{ int c; }
> 
> BOOST_FUSION_ADAPT_STRUCT(A,(int,a) )
> BOOST_FUSION_ADAPT_STRUCT(B,(int,b) )
> BOOST_FUSION_ADAPT_DERIVED(
>    C, (A)(B),
>    (int,c)
> )
> 
> an instance of C is now a fusion sequence of size 3.
> http://svn.boost.org/svn/boost/sandbox/intro/boost/fusion/adapted/struct/a
> dapt_derived.hpp
> 
> private inheritance is supported as above, virtual inheritance is not.
> I'm not sure if virtual inheritance can be supported.

Have you seen the new BOOST_FUSION_ADAPT_CLASS() family of utilities which
allow using (member-) functions instead of direct access to the data members
of a class/struct?

Regards Hartmut

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