Subject: [boost] [fusion] [intro] ADAPT_STRUCT extensions
From: Stefan Strasser (strasser_at_[hidden])
Date: 2010-07-29 15:44:20
Hi,
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/adapt_derived.hpp
private inheritance is supported as above, virtual inheritance is not.
I'm not sure if virtual inheritance can be supported.