Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::signals2::trackable — Provided to ease porting for code using the boost::signals::trackable class from the original Boost.Signals library.
// In header: <boost/signals2/trackable.hpp> class trackable { public: // construct/copy/destruct trackable(); trackable(const trackable&); trackable& operator=(const trackable&); ~trackable(); };
Use of the trackable class is not recommended
for new code. The trackable class is not thread-safe
since trackable objects disconnect their associated
connections in the trackable destructor.
Since the trackable destructor is not run until
after the destructors of any derived classes have completed,
that leaves open a window where a partially destructed
object can still have active connections.
The preferred method of automatic connection management
with Boost.Signals2 is to manage the lifetime of
tracked objects with shared_ptrs and
to use the signals2::slot::track
method to track their lifetimes.
The trackable class provides automatic
disconnection of signals and slots when objects bound in
slots (via pointer or reference) are destroyed.
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. |