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AlignableDetOrUnitPtr.h

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#ifndef Alignment_CommonAlignment_AlignableDetOrUnitPtr_H
#define Alignment_CommonAlignment_AlignableDetOrUnitPtr_H

class Alignable;
class AlignableDet;
class AlignableDetUnit;

class AlignableDetOrUnitPtr 
{  
 public:
  inline AlignableDetOrUnitPtr(AlignableDet *aliDet) : theAliDet(aliDet), theAliDetUnit(0) {}
  inline AlignableDetOrUnitPtr(AlignableDetUnit *aliDetUnit) 
    : theAliDet(0), theAliDetUnit(aliDetUnit) {}
  inline ~AlignableDetOrUnitPtr() {}

  inline AlignableDetOrUnitPtr& operator = (AlignableDet* aliDet) {
    theAliDet = aliDet; theAliDetUnit = 0; return *this;}
  inline AlignableDetOrUnitPtr& operator = (AlignableDetUnit* aliDetUnit) {
    theAliDet = 0; theAliDetUnit = aliDetUnit; return *this;}
  // Default operator= and default copy constructor are fine, no need to code them here.

  // conversions to Alignable* etc.
  operator Alignable* ();
  operator const Alignable* () const;
  inline Alignable* operator->() { return this->operator Alignable*();}
  inline const Alignable* operator->() const { return this->operator const Alignable*();}
  // explicit call if needed:
  inline Alignable* alignable() { return this->operator Alignable*();}
  inline const Alignable* alignable() const { return this->operator const Alignable*();}

  // explicit access to specific types
  inline AlignableDet* alignableDet() { return theAliDet;}
  inline const AlignableDet* alignableDet() const { return theAliDet;}
  inline AlignableDetUnit* alignableDetUnit() { return theAliDetUnit;}
  inline const AlignableDetUnit* alignableDetUnit() const { return theAliDetUnit;}

  inline bool isNull() const { return (!theAliDet && !theAliDetUnit);}

private:
  AlignableDet     *theAliDet;      
  AlignableDetUnit *theAliDetUnit;  
};

#endif

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