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// -*- C++ -*-
//
// ReferenceCounted.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_ReferenceCounted_H
#define ThePEG_ReferenceCounted_H
// This is the declaration of the ReferenceCounted class.
#include "RCPtr.fh"
#include "ThePEG/Persistency/PersistentIStream.fh"
namespace ThePEG {
namespace Pointer {
/**
* ReferenceCounted must be the (virtual) base class of all
* classes which may be pointed to by the RCPtr smart
* pointer class. It keeps track of all RCPtr and
* ConstRCPtr pointers which are currently pointing to an
* object.
*
* @see RCPtr
* @see ConstRCPtr
*/
class ReferenceCounted {
/** The RCPtrBase class needs to acces the private parts of ReferenceCounted. */
friend class RCPtrBase;
friend class ThePEG::PersistentIStream;
public:
/**
* The integer type used for counting.
*/
typedef unsigned int CounterType;
protected:
/** @name Standard constructors and assignment. */
//@{
/**
* Default constructor.
*/
ReferenceCounted()
: uniqueId(++objectCounter),
theReferenceCounter(CounterType(1)) {}
/**
* Copy-constructor.
*/
ReferenceCounted(const ReferenceCounted &)
: uniqueId(++objectCounter),
theReferenceCounter(CounterType(1)) {}
/**
* Assignment.
*/
ReferenceCounted & operator=(const ReferenceCounted &)
{
return *this;
}
//@}
public:
/**
* Return the reference count.
*/
CounterType referenceCount() const
{
return theReferenceCounter;
}
private:
/**
* Increment the reference count.
*/
void incrementReferenceCount() const
{
++theReferenceCounter;
}
/**
* Decrement with the reference count.
*/
bool decrementReferenceCount() const
{
return !--theReferenceCounter;
}
public:
/**
* The unique ID. Can be used as sorting criterion, e.g. for set<> and map<>.
*/
const unsigned long uniqueId;
private:
/**
* A counter for issuing unique IDs. It will overflow back to 0 eventually,
* but it is very unlikely that two identical IDs show up in the same event.
*/
static unsigned long objectCounter;
/**
* The reference count.
*/
mutable CounterType theReferenceCounter;
};
}
}
#endif /* ThePEG_ReferenceCounted_H */
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