id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7569	Compile Error using BOOST_FUSION_DEFINE_STRUCT_INLINE with VC10 and GCC <4.5	oswin.krause@…	Joel de Guzman	"As laid out on the mailing list, because of too much class nesting, a few compilers won't get the macro to work with partial template spcialisations of the nested classes.

a work around is instead of doing something like this (for example in iterator::deref):


{{{
//using (A1, a1)(A2, a2)...(AN, an) as struct arguments
typedef A1 t1_type;
typedef A2 t2_type;
...
t1_type& t1;//linked to a1
t2_type& t2;//linked to a2
...

template<int>
struct deref{};

template<>
struct deref<1>{
    typedef t1_type& type;
    type call(Sequence& seq){
        return seq.t1;
    }
};
}}}


use a fusion vector to get rid of the partial template specialisation


{{{
typedef boost::fusion::vector<A1&,A2&,...AN&> t_seq;
t_seq t;//tied to a1...an
template<int N>
struct deref{
    typedef result_of::at_c<t_seq,N> type;
    type call(Sequence& seq){
        return at_c<N>(seq.t);
    }
};
}}}
"	Bugs	closed	To Be Determined	fusion	Boost 1.51.0	Problem	fixed