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RefObject Class Reference

`#include <yateclass.h>`

Inheritance diagram for RefObject:

## Public Member Functions
| RefObject ()
virtual | ~RefObject ()
virtual void * | getObject (const String &name) const
virtual bool | alive () const
bool | ref ()
bool | deref ()
int | refcount () const
virtual void | destruct ()
Public Member Functions inherited from GenObject
| GenObject ()
virtual | ~GenObject ()
virtual const String & | toString () const
virtual const String & | traceId () const
NamedCounter * | getObjCounter () const
NamedCounter * | setObjCounter (NamedCounter *counter)

## Static Public Member Functions
static bool | alive (const RefObject *obj)
static bool | efficientIncDec ()
Static Public Member Functions inherited from GenObject
static void * | getObject (const String &name, const GenObject *obj)
static bool | getObjCounting ()
static void | setObjCounting (bool enable)
static NamedCounter * | getObjCounter (const String &name, bool create=true)
static ObjList & | getObjCounters ()

## Protected Member Functions
virtual void | zeroRefs ()
bool | resurrect ()
virtual void | destroyed ()

## Detailed Description

A reference counted object. Whenever using multiple inheritance you should inherit this class virtually.

## Constructor & Destructor Documentation

RefObject | ( |  | ) |

The constructor initializes the reference counter to 1! Use deref() to destruct the object when safe

virtual ~RefObject | ( |  | ) |
| virtual

Destructor.

## Member Function Documentation

virtual bool alive | ( |  | ) | const
| virtual

Check if the object is still referenced and safe to access. Note that you should not trust this result unless the object is locked by other means.

Returns
  True if the object is referenced and safe to access

Reimplemented from GenObject.

static bool alive | ( | const RefObject * | obj | ) |
| inline static

Check if a refcounted object is still alive

Parameters

  obj | Pointer to the object to check

Returns
  True if the pointer is not null and the object is referenced

References RefObject::refcount().

bool deref | ( |  | ) |

Decrements the reference counter, destroys the object if it reaches zero

    // Deref this object, return quickly if the object was deleted
    if (deref()) return;

Returns
  True if the object may have been deleted, false if it still exists and is safe to access

virtual void destroyed | ( |  | ) |
| protected virtual

Pre-destruction notification, called just before the object is deleted. Unlike in the destructor it is safe to call virtual methods here. Reimplementing this method allows to perform any object cleanups.

Reimplemented in DurationUpdate, MucRoom, ClientContact, ClientAccount, ClientChannel, CallEndpoint, DataEndpoint, ThreadedSource, DataSource, and DataConsumer.

virtual void destruct | ( |  | ) |
| virtual

Refcounted objects should just have the counter decremented. That will destroy them only when the refcount reaches zero.

Reimplemented from GenObject.

static bool efficientIncDec | ( |  | ) |
| static

Check if reference counter manipulations are efficient on this platform. If platform does not support atomic operations a mutex pool is used.

Returns
  True if refcount uses atomic integer operations

virtual void* getObject | ( | const String & | name | ) | const
| virtual

Get a pointer to a derived class given that class name

Parameters

  name | Name of the class we are asking for

Returns
  Pointer to the requested class or NULL if this object doesn't implement it

Reimplemented from GenObject.

Reimplemented in SocketRef, Array, Channel, CallEndpoint, DataEndpoint, DataTranslator, DataSource, and DataConsumer.

Referenced by SocketRef::getObject(), and Message::userObject().

bool ref | ( |  | ) |

Increments the reference counter if not already zero

Returns
  True if the object was successfully referenced and is safe to access

Referenced by MucRoom::status().

int refcount | ( |  | ) | const
| inline

Get the current value of the reference counter

Returns
  The value of the reference counter

Referenced by RefObject::alive().

bool resurrect | ( |  | ) |
| protected

Bring the object back alive by setting the reference counter to one. Note that it works only if the counter was zero previously

Returns
  True if the object was resurrected - its name may be Lazarus ;-)

virtual void zeroRefs | ( |  | ) |
| protected virtual

This method is called when the reference count reaches zero after unlocking the mutex if the call to zeroRefsTest() returned true. The default behaviour is to delete the object.

Reimplemented in Channel.

The documentation for this class was generated from the following file:

- yateclass.h