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#ifndef Tracker_ProxyBase_H
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#define Tracker_ProxyBase_H
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#include "TrackingTools/TrajectoryParametrization/interface/TrajectoryStateExceptions.h"
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#include "TrackingTools/TrajectoryState/interface/CopyUsingNew.h"
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/** A base class for reference counting proxies.
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* The class to which this one is proxy must inherit from
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* ReferenceCounted.
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* A ProxyBase has value semantics, in contrast to ReferenceCountingPointer,
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* which has pointer semantics.
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* The Proxy class inheriting from ProxyBase must duplicate the
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* part of the interface of the reference counted class that it whiches to expose.
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*/
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template <class T, class Cloner >
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class ProxyBase {
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protected:
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ProxyBase() : theData(0) {}
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explicit ProxyBase( T* p) : theData(p) {if (theData) theData->addReference();}
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ProxyBase( const ProxyBase& other) {
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theData = other.theData;
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if (theData) theData->addReference();
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}
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~ProxyBase() {
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destroy();
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}
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ProxyBase& operator=( const ProxyBase& other) {
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if ( theData != other.theData) {
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destroy();
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theData = other.theData;
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if (theData) theData->addReference();
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}
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return *this;
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}
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void swap(ProxyBase& other) {
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std::swap(theData,other.theData);
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}
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#if defined( __GXX_EXPERIMENTAL_CXX0X__)
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ProxyBase(ProxyBase&& other) {
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theData = other.theData;
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other.theData=0;
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}
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ProxyBase& operator=(ProxyBase&& other) {
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if ( theData != other.theData) {
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destroy();
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theData = other.theData;
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other.theData=0;
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}
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return *this;
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}
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#endif
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const T& data() const { check(); return *theData;}
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T& unsharedData() {
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check();
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if ( references() > 1) {
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theData->removeReference();
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theData = Cloner().clone( *theData);
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if (theData) theData->addReference();
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}
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return *theData;
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}
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T& sharedData() { check(); return *theData;}
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bool isValid() const { return theData != 0;}
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void check() const {
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if (theData == 0)
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throw TrajectoryStateException("Error: uninitialized ProxyBase used");
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}
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void destroy() { if (isValid()) theData->removeReference();}
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int references() const {return theData->references();}
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private:
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T* theData;
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};
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template <class T, class Cloner >
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inline
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void swap(ProxyBase<T,Cloner>& lh, ProxyBase<T,Cloner>& rh) {
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lh.swap(rh);
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}
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#endif // Tracker_ProxyBase_H
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