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boost::signals::trackable — Enables safe use of multicast callbacks.
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 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:
*this
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.
| Copyright © 2001-2004 Douglas Gregor |