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## Class template signal

boost::signal — Safe multicast callback.

## Synopsis

    template<typename Signature,   // Function type R (T1, T2, ..., TN)
             typename Combiner = last_value<R>,
             typename Group = int,
             typename GroupCompare = std::less<Group>,
             typename SlotFunction = functionN<Signature> >
    class signal : public signalN<R, T1, T2, ..., TN, Combiner, Group, GroupCompare, SlotFunction>
    {
    public:
      // construct/copy/destruct
      signal(const combiner_type& = combiner_type(),
             const group_compare_type& = group_compare_type());
    };

## Description

Class template signal is a thin wrapper around the numbered class templates signal0, signal1, etc. It accepts a function type with N arguments instead of N separate arguments, and derives from the appropriate signalN instantiation.

All functionality of this class template is in its base class signalN.

### `signal` public construct/copy/destruct

1.     signal(const combiner_type& combiner = combiner_type(),
              const group_compare_type& compare = group_compare_type());

   Effects: | Initializes the base class with the given combiner and comparison objects.