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#ifndef DataFormats_Common_FwdPtr_h
#define DataFormats_Common_FwdPtr_h
// -*- C++ -*-
//
// Package:     Common
// Class  :     FwdPtr
//
//
// Original Author:  Salvatore Rappoccio
//         Created:  Fri Feb  5 14:58:49 CST 2010
//

// system include files
#include "boost/type_traits/is_base_of.hpp"
#include "boost/utility/enable_if.hpp"

// user include files
#include "DataFormats/Common/interface/CMS_CLASS_VERSION.h"
#include "DataFormats/Common/interface/RefCore.h"
#include "DataFormats/Common/interface/Ptr.h"
#include "DataFormats/Common/interface/traits.h"
#include "DataFormats/Common/interface/GetProduct.h"
#include "DataFormats/Common/interface/EDProduct.h"
#include "DataFormats/Common/interface/EDProductGetter.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/OrphanHandle.h"
#include "DataFormats/Common/interface/TestHandle.h"

#include "FWCore/Utilities/interface/EDMException.h"

// forward declarations
namespace edm {
  template <typename T>
    class FwdPtr {
    friend class FwdPtrVectorBase;
  public:
    
    typedef unsigned long key_type;
    typedef T   value_type;
    
    // General purpose constructor from two Ptrs.
    template <typename C>
    FwdPtr( Ptr<C> f, Ptr<C> b):
    ptr_(f), backPtr_(b)
    {}
    
  FwdPtr():
    ptr_(), backPtr_()
      {}
    
  FwdPtr(FwdPtr<T> const& iOther):
    ptr_(iOther.ptr_), backPtr_(iOther.backPtr_)
      {}
    
    /*     template<typename U> */
    /*     FwdPtr(FwdPtr<U> const& iOther, typename boost::enable_if_c<boost::is_base_of<T, U>::value>::type * t = 0): */
    /*     ptr_(iOther.ptr_, t), backPtr_(iOther.backPtr_,t) */
    /*     { */
    /*     } */
    
    /*     template<typename U> */
    /*     explicit */
    /*     FwdPtr(FwdPtr<U> const& iOther, typename boost::enable_if_c<boost::is_base_of<U, T>::value>::type * t = 0): */
    /*     ptr_(iOther.ptr_,t), backPtr_(iOther.backPtr_,t){} */
    
    
    ~FwdPtr() {}
    
    T const&
    operator*() const { return ptr_.isNonnull() ? ptr_.operator*() : backPtr_.operator*();}

    T const*
    operator->() const{ return ptr_.isNonnull() ? ptr_.operator->() : backPtr_.operator->();}

    T const* get() const { return ptr_.isNonnull() ? ptr_.get() : backPtr_.get();}


    bool isNull() const {return !isNonnull(); }
    
    //bool isNonnull() const {return id().isValid(); }
    bool isNonnull() const {return ptr_.isNonnull() || backPtr_.isNonnull(); }
    bool operator!() const {return isNull();}
    
    bool isAvailable() const {return ptr_.isAvailable() || backPtr_.isAvailable();}
    
    bool isTransient() const {return ptr_.isTransient();}
    
    ProductID id() const {return ptr_.isNonnull() ? ptr_.id() : backPtr_.id();}

    EDProductGetter const* productGetter() const {
      if ( ptr_.productGetter() ) return ptr_.productGetter();
      else return backPtr_.productGetter();
    }

    key_type key() const {return ptr_.isNonnull() ? ptr_.key() : backPtr_.key() ;}
    
    bool hasProductCache() const { return ptr_.hasProductCache() || backPtr_.hasProductCache();} 
    
    RefCore const& refCore() const {return ptr_.isNonnull() ? ptr_.refCore() : backPtr_.refCore() ;}
    // ---------- member functions ---------------------------
    
    void const* product() const {return 0;}
    
    Ptr<value_type> const & ptr() const { return ptr_;}
    Ptr<value_type> const & backPtr() const { return backPtr_;}
      
    //Used by ROOT storage
    CMS_CLASS_VERSION(10)

  private:
    Ptr<value_type> ptr_;
    Ptr<value_type> backPtr_;
  };
  

  template <typename T>
  inline
  bool
  operator==(FwdPtr<T> const& lhs, FwdPtr<T> const& rhs) {
    return ( lhs.ptr() == rhs.ptr() ||
             lhs.backPtr() == rhs.ptr() ||
             lhs.ptr() == rhs.backPtr() ||
             lhs.backPtr() == rhs.backPtr() );
  }

  template <typename T>
  inline
  bool
  operator!=(FwdPtr<T> const& lhs, FwdPtr<T> const& rhs) {
    return !(lhs == rhs);
  }

  template <typename T>
  inline
  bool
  operator<(FwdPtr<T> const& lhs, FwdPtr<T> const& rhs) {
    return ( lhs.ptr() < rhs.ptr()  );
  }

}

#endif