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boost::signals::trackable — Enables safe use of multicast callbacks.
// In header: <boost/signals/trackable.hpp> class trackable { public: // construct/copy/destruct trackable(); trackable(const trackable&); trackable& operator=(const trackable&); ~trackable(); };
The trackable class provides automatic
          disconnection of signals and slots when objects bound in
          slots (via pointer or reference) are destroyed. The
          trackable class may only be used as a public
          base class for some other class; when used as such, that
          class may be bound to function objects used as part of
          slots. The manner in which a trackable object
          tracks the set of signal-slot connections it is a part of is
          unspecified.
The actual use of trackable is contingent
          on the presence of appropriate
          visit_each overloads for any
          type that may contain pointers or references to trackable
          objects.
trackable 
        public
       construct/copy/destructtrackable();
| Effects: | Sets the list of connected slots to empty. | 
| Throws: | Will not throw. | 
trackable(const trackable& other);
| Effects: | Sets the list of connected slots to empty. | 
| Throws: | Will not throw. | 
| Rationale: | Signal-slot connections can only be created via calls to an explicit connect method, and therefore cannot be created here when trackable objects are copied. | 
trackable& operator=(const trackable& other);
| Effects: | Sets the list of connected slots to empty. | 
| Returns: | 
 | 
| Throws: | Will not throw. | 
| Rationale: | Signal-slot connections can only be created via calls to an explicit connect method, and therefore cannot be created here when trackable objects are copied. | 
~trackable();
| Effects: | Disconnects all signal/slot connections that contain a pointer or reference to this trackable object that can be found by visit_each. |