TYPEMAP
Math_Fractal_Julia *	T_PTROBJ_SPECIAL

INPUT
T_PTROBJ_SPECIAL
    if (sv_derived_from($arg, \"${(my $ntt=$ntype)=~s/_/::/g;\$ntt}\")) {
        IV tmp = SvIV((SV*)SvRV($arg));
        $var = INT2PTR($type, tmp);
    }
    else
        croak(\"$var is not of type ${(my $ntt=$ntype)=~s/_/::/g;\$ntt}\")

OUTPUT
T_PTROBJ_SPECIAL
    sv_setref_pv($arg, \"${(my $ntt=$ntype)=~s/_/::/g;\$ntt}\", (void*)$var);
