Event/DecayChain/include/DecayChain/Element/ReferenceHolderBase.h

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#ifndef DCHAIN_REFERENCEHOLDERBASE_H
#define DCHAIN_REFERENCEHOLDERBASE_H
// -*- C++ -*-
//
// Package:     DChain
// Module:      ReferenceHolderBase
//
// Description: Base implementation of smart pointer for classes that inherit from
// ReferenceCount
//
// Usage:
//   ReferenceHolderBase()  - default constructor
//   ~ReferenceHolderBase() - destructor
//
// Author:      Simon Patton
// Created:     Fri May 17 08:01:51 EDT 1996
// $Id: ReferenceHolderBase.h,v 1.1.1.1 2009/03/03 06:06:56 maqm Exp $
//
// Revision history
//
// $Log: ReferenceHolderBase.h,v $
// Revision 1.1.1.1  2009/03/03 06:06:56  maqm
// first import of DecayChain
//
// Revision 1.1  2006/01/11 20:28:10  cdj
// massive class renaming, addition of [] for selection and unit tests
//
// Revision 1.1  2003/05/15 19:56:02  cdj
// revamped memory handling so always use a ReferenceHolder to deal with the reference counting
//
//
 
// system include files
 
// user include files
 
// forward declarations
namespace dchain {
  template <class TPtr, class TRef> class ReferenceHolderBase {
  public:
    // Constructors and destructor
    ReferenceHolderBase() : m_ref( 0 ) {}
    ReferenceHolderBase( TPtr iRef ) : m_ref( iRef ) {
      if ( 0 != m_ref ) { m_ref->addLink(); }
    }
    ~ReferenceHolderBase() {
      if ( 0 != m_ref ) { m_ref->dropLink(); }
    }
 
    ReferenceHolderBase( const ReferenceHolderBase<TPtr, TRef>& iOther )
        : m_ref( iOther.m_ref ) {
      if ( 0 != m_ref ) { m_ref->addLink(); }
    }
 
    // assignment operator(s)
    const ReferenceHolderBase& operator=( const ReferenceHolderBase<TPtr, TRef>& iRHS ) {
      if ( 0 != iRHS.m_ref ) { iRHS.m_ref->addLink(); }
      if ( 0 != m_ref ) { m_ref->dropLink(); }
      m_ref = iRHS.m_ref;
      return *this;
    }
 
    // const member functions
    TPtr operator->() const { return m_ref; }
 
    TRef operator*() const { return *m_ref; }
 
    TPtr pointer() const { return m_ref; }
 
  private:
    // data members
    TPtr m_ref;
  };
 
  // inline function definitions
 
  //
  // constructors and destructor
  //
 
  //
  // member functions
  //
 
} // namespace dchain
#endif // DCHAIN_REFERENCEHOLDERBASE_H