/usr/include/root/TGeoExtension.h is in libroot-geom-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
// Author: Andrei.Gheata@cern.ch 29/05/2013
// Following proposal by Markus Frank
#ifndef ROOT_TGeoExtension
#define ROOT_TGeoExtension
#include <cassert>
#ifndef ROOT_TObject
#include "TObject.h"
#endif
//______________________________________________________________________________
// TGeoExtension - ABC for user objects attached to TGeoVolume or TGeoNode.
// Provides interface for getting a reference (grab) and
// releasing the extension object (release), allowing for
// derived classes to implement reference counted sharing.
// The user who should attach extensions to logical volumes
// or nodes BEFORE applying misalignment information so that
// these will be available to all copies.
//______________________________________________________________________________
class TGeoExtension : public TObject
{
protected:
TGeoExtension() : TObject() {}
virtual ~TGeoExtension() {}
public:
// Method called whenever requiring a pointer to the extension
// Equivalent to new()
virtual TGeoExtension *Grab() = 0;
// Method called always when the pointer to the extension is not needed
// Equivalent to delete()
virtual void Release() const = 0;
ClassDef(TGeoExtension, 1) // User extension for volumes and nodes
};
//______________________________________________________________________________
// TGeoRCExtension - Reference counted extension which has a pointer to and
// owns a user defined TObject. This class can be used as
// model for a reference counted derivation from TGeoExtension.
// The user object becomes owned by the extension.
//______________________________________________________________________________
class TGeoRCExtension : public TGeoExtension
{
protected:
virtual ~TGeoRCExtension() {delete fUserObject;}
public:
TGeoRCExtension() : TGeoExtension(), fRC(0), fUserObject(0) {fRC++;}
TGeoRCExtension(TObject *obj) : TGeoExtension(), fRC(0), fUserObject(obj) {fRC++;}
TGeoExtension *Grab() {fRC++; return this;}
void Release() const {assert(fRC > 0); fRC--; if (fRC ==0) delete this;}
void SetUserObject(TObject *obj) {fUserObject = obj;}
TObject *GetUserObject() const {return fUserObject;}
private:
// Copy constructor and assignment not allowed
TGeoRCExtension(const TGeoRCExtension &); // Not implemented
TGeoRCExtension &operator =(const TGeoRCExtension &); // Not implemented
mutable Int_t fRC; // Reference counter
TObject *fUserObject; // Attached user object
ClassDef(TGeoRCExtension, 1) // Reference counted extension for volumes and nodes
};
#endif
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