template<BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION_DECL(BOOST_SIGNALS2_NUM_ARGS)>
class BOOST_SIGNALS2_SLOT_CLASS_NAME(BOOST_SIGNALS2_NUM_ARGS) BOOST_SIGNALS2_SLOT_TEMPLATE_SPECIALIZATION
- : public slot_base, public detail::BOOST_SIGNALS2_STD_FUNCTIONAL_BASE(R)
+ : public slot_base, public detail::BOOST_SIGNALS2_STD_FUNCTIONAL_BASE
{
public: