Function get_vtable

include/win/boost/function/function_template.hpp:684–687

      vtable_type;

    vtable_type* get_vtable() const {
      return reinterpret_cast<vtable_type*>(
               reinterpret_cast<std::size_t>(vtable) & ~static_cast<std::size_t>(0x01));
    }

    struct clear_type {};