RefVectorHolderBase.h

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#ifndef DataFormats_Common_RefVectorHolderBase_h
#define DataFormats_Common_RefVectorHolderBase_h
#include "DataFormats/Common/interface/RefHolderBase.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "boost/shared_ptr.hpp"

namespace edm {
  template <typename T> class RefToBase;
  namespace reftobase {
    class RefVectorHolderBase {
    public:
      virtual ~RefVectorHolderBase() {}
      typedef size_t size_type;
      typedef RefHolderBase value_type;
      void swap(RefVectorHolderBase& other) {} // nothing to swap
      virtual bool empty() const = 0;
      virtual size_type size() const = 0;
      virtual void clear() = 0;
      virtual void reserve( size_type n ) = 0;
      virtual ProductID id() const = 0;
      virtual EDProductGetter const* productGetter() const = 0;
      virtual RefVectorHolderBase * clone() const = 0;
      virtual RefVectorHolderBase * cloneEmpty() const = 0;
      virtual void push_back( const RefHolderBase * r ) = 0;
      // the following structure is public
      // to allow reflex dictionary to compile
      //    protected:
      struct const_iterator_imp {
    typedef ptrdiff_t difference_type;
    const_iterator_imp() { }
    virtual ~const_iterator_imp() { }
    virtual const_iterator_imp * clone() const = 0;
    virtual void increase() = 0;
    virtual void decrease() = 0;
    virtual void increase( difference_type d ) = 0;
    virtual void decrease( difference_type d ) = 0;
    virtual bool equal_to( const const_iterator_imp * ) const = 0;
    virtual bool less_than( const const_iterator_imp * ) const = 0;
    virtual void assign( const const_iterator_imp * ) = 0;
    virtual boost::shared_ptr<RefHolderBase> deref() const = 0;
    virtual difference_type difference( const const_iterator_imp * ) const = 0;
      };

      struct const_iterator : public std::iterator <std::random_access_iterator_tag, void *>{
    typedef boost::shared_ptr<RefHolderBase> value_type;
    typedef std::ptrdiff_t difference_type;
    const_iterator() : i( 0 ) { }
    const_iterator( const_iterator_imp * it ) : i( it ) { }
    const_iterator( const const_iterator & it ) : i( it.isValid() ? it.i->clone() : 0 ) { }
    ~const_iterator() { delete i; }
    const_iterator & operator=( const const_iterator & it ) {
      if ( isInvalid() ) i = it.i;
      else i->assign( it.i );
      return *this;
    }
    const_iterator& operator++() {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to increment an inavlid RefToBaseVector<T>::const_iterator\n");
      i->increase();
      return *this;
    }
    const_iterator operator++( int ) {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to postincrement an inavlid RefToBaseVector<T>::const_iterator\n");
      const_iterator ci = *this;
      i->increase();
      return ci;
    }
    const_iterator& operator--() {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to decrement an inavlid RefToBaseVector<T>::const_iterator\n");
      i->decrease();
      return *this;
    }
    const_iterator operator--( int ) {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to postdecrement an inavlid RefToBaseVector<T>::const_iterator\n");
      const_iterator ci = *this;
      i->decrease();
      return ci;
    }
    difference_type operator-( const const_iterator & o ) const {
      if ( isInvalid() && o.isInvalid() ) return 0;
      if ( isInvalid() || o.isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to compute difference with an inavlid RefToBaseVector<T>::const_iterator\n");
      return i->difference( o.i );
    }
    const_iterator operator+( difference_type n ) const {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to compute sum with an inavlid RefToBaseVector<T>::const_iterator\n");
      const_iterator_imp * ii = i->clone();
      ii->increase( n );
      return const_iterator( ii );
    }
    const_iterator operator-( difference_type n ) const {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to compute difference with an inavlid RefToBaseVector<T>::const_iterator\n");
      const_iterator_imp * ii = i->clone();
      ii->decrease( n );
      return const_iterator( ii );
    }
    bool operator<( const const_iterator & o ) const {
      if ( isInvalid() && o.isInvalid() ) return false;
      if ( isInvalid() || o.isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to compute < operator with an inavlid RefToBaseVector<T>::const_iterator\n");
      return i->less_than( o.i );
    }
    bool operator==( const const_iterator& ci ) const {
      if ( isInvalid() && ci.isInvalid() ) return true;
      if ( isInvalid() || ci.isInvalid() ) return false;
      return i->equal_to( ci.i );
    }
    bool operator!=( const const_iterator& ci ) const {
      if ( isInvalid() && ci.isInvalid() ) return false;
      if ( isInvalid() || ci.isInvalid() ) return true;
      return ! i->equal_to( ci.i );
    }
    value_type operator * () const {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to dereference an inavlid RefToBaseVector<T>::const_iterator\n");
      return i->deref();
    }
    const_iterator & operator -=( difference_type d ) {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to decrement an inavlid RefToBaseVector<T>::const_iterator\n");
      i->decrease( d );
      return *this;
    }
    const_iterator & operator +=( difference_type d ) {
      if ( isInvalid() )
        Exception::throwThis(errors::InvalidReference,
          "Trying to increment an inavlid RefToBaseVector<T>::const_iterator\n");
      i->increase( d );
      return *this;
    }
    bool isValid() const { return i != 0; }
    bool isInvalid() const { return i == 0; }

      private:
    const_iterator_imp * i;
      };

      virtual const_iterator begin() const = 0;
      virtual const_iterator end() const = 0;
      template <class T> RefToBase<T> getRef( size_t idx ) const;
      virtual const void * product() const = 0;
      virtual void reallyFillView( const void *, const ProductID &, std::vector<void const*> & ) = 0;
      virtual size_t keyForIndex(size_t idx) const = 0;

      virtual bool isAvailable() const = 0;

    private:
      virtual boost::shared_ptr<reftobase::RefHolderBase> refBase(size_t idx) const = 0;
    };

    template <class T>
    RefToBase<T> RefVectorHolderBase::getRef( size_t idx ) const {
      boost::shared_ptr<reftobase::RefHolderBase> rb = refBase(idx);
      return RefToBase<T>( rb );
    }

    // Free swap function
    inline
    void swap(RefVectorHolderBase& lhs, RefVectorHolderBase& rhs) {
      lhs.swap(rhs);
    }

  }
}

#endif