/usr/include/osg/Observer is in libopenscenegraph-dev 3.0.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_OBSERVER
#define OSG_OBSERVER 1
#include <OpenThreads/Mutex>
#include <osg/Referenced>
#include <set>
namespace osg {
/** Observer base class for tracking when objects are unreferenced (there reference count goes to 0) and are being deleted.*/
class OSG_EXPORT Observer
{
public:
Observer();
virtual ~Observer();
/** objectDeleted is called when the observed object is about to be deleted. The observer will be automatically
* removed from the observerd objects observer set so there is no need for the objectDeleted implementation
* to call removeObserver() on the observed object. */
virtual void objectDeleted(void*) {}
};
/** Class used by osg::Referenced to track the observers associated with it.*/
class OSG_EXPORT ObserverSet : public osg::Referenced
{
public:
ObserverSet(const Referenced* observedObject);
Referenced* getObserverdObject() { return _observedObject; }
const Referenced* getObserverdObject() const { return _observedObject; }
/** "Lock" a Referenced object i.e., protect it from being deleted
* by incrementing its reference count.
*
* returns null if object doesn't exist anymore. */
Referenced* addRefLock();
inline OpenThreads::Mutex* getObserverSetMutex() const { return &_mutex; }
void addObserver(Observer* observer);
void removeObserver(Observer* observer);
void signalObjectDeleted(void* ptr);
typedef std::set<Observer*> Observers;
Observers& getObservers() { return _observers; }
const Observers& getObservers() const { return _observers; }
protected:
ObserverSet(const ObserverSet& rhs): osg::Referenced(rhs) {}
ObserverSet& operator = (const ObserverSet& /*rhs*/) { return *this; }
virtual ~ObserverSet();
mutable OpenThreads::Mutex _mutex;
Referenced* _observedObject;
Observers _observers;
};
}
#endif
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