Boost.Signals: header <boost/signal.hpp>

Header

#include <boost/signal.hpp>

Synopsis

The specification form for the signal class template uses two positive integers, BOOST_SIGNALS_MAX_ARGS and N. The former describes the maximum number of function parameters that may be passed onto the underlying slots, whereas the latter describes the number of function parameters for a given instantiation of signal. BOOST_SIGNALS_MAX_ARGS is present in the header as a preprocessor macro defining the maximum number of arguments supported by the implementation.

namespace boost {
  template<typename Signature, // Function type R (T1, T2, ..., TN)
           typename Combiner = last_value<typename function_traits<Signature>::result_type>,
           typename Group = int,
           typename GroupCompare = std::less<int>,
           typename SlotFunction = function<Signature> >
  class signal : public signalN<R, T1, T2, ..., TN, Combiner, Group, GroupCompare, SlotFunction>
  {
    explicit signal(const Combiner& = Combiner(), const GroupCompare& = GroupCompare());
  };
}

Constructor

explicit signal(const Combiner& combiner = Combiner(), const GroupCompare& group_compare = GroupCompare());

• Effects: initializes base class with combiner and group_compare.