Interface to NavigableToken weights. More...

#include <CaloCellPrefetchIterator.h>

Collaboration diagram for CaloEvent_detail::paramholder< T, TAG >:

Public Types
typedef int	param_t
	Type for the parameter (a dummy here). More...

Public Member Functions
param_t	getParameter () const
	Return the current parameter (will always be 1). More...

Private Member Functions
void	next ()
	Move to the next weight (a no-op). More...

void	fetch (const T &it)
	Fetch the next weight from the iterator (a no-op). More...

Friends
class	CaloCellPrefetchIterator< T >

Detailed Description

template<class T, class TAG>
struct CaloEvent_detail::paramholder< T, TAG >

Interface to NavigableToken weights.

No-weight version.

We want our iterator to work with both NavigableToken iterators and normal iterators. The key difference is that NavigableToken also has a weight attached to each element. In that case, we need to save weights in the iterator, like we do below for cell pointers. However, we don't want to do that in the case where we don't actually have weights.

Thus, we break out the part handing the weights into a base class of CaloCellPrefetchIterator. We recognize the NavigableToken case because its iterator has a special iterator_category. So, we have a specialized version of the paramholder class for this case. The unspecialized case handles the case where there are no weights. It's empty, so when used as a base class, should not increase the size of the iterator.

This is the unspecialized case.

Definition at line 52 of file CaloCellPrefetchIterator.h.