Method accept

extern/boost/boost/bind/storage.hpp:82–86

    storage2( A1 a1, A2 a2 ): storage1<A1>( a1 ), a2_( a2 ) {}

    template<class V> void accept(V & v) const
    {
        inherited::accept(v);
        BOOST_BIND_VISIT_EACH(v, a2_, 0);
    }

    A2 a2_;
};