cmsutils Namespace Reference

Classes
class	_bqueue_item
class	_bqueue_itr
class	bqueue

Functions
template<class T >
void	intrusive_ptr_add_ref (_bqueue_item< T > *it)
template<class T >
void	intrusive_ptr_release (_bqueue_item< T > *it)
template<typename T >
void	swap (bqueue< T > &rh, bqueue< T > &lh)

Detailed Description

Backwards linked queue with "head sharing"

Author: Giovanni Petrucciani

For use in trajectory building, where we want to "fork" a trajectory candidate in two without copying around all the hits before the fork.

Supported operations (mimics a std container):

• push_back()
• fork() which returns a new queue that shares the head part with the old one
• copy constructor, which just does fork()
• rbegin(), rend(): return iterators which can work only backwards for (cmsutils::bqueue<T>::const_iterator it = queue.rbegin(), end = queue.rend(); it != end; –it) { ... }
• front() and back(): returns a reference to the first and last element
• size(), empty(): as expected. size() does not count the items

Note that boost::intrusive_ptr is used for items, so they are deleted automatically while avoiding problems if one deletes a queue which shares the head with another one

Disclaimer: I'm not sure the const_iterator is really const-correct..

V.I. 22/08/2012 As the bqueue is made to be shared its content ahs been forced to be constant. This avoids that accidentally an update in one Trajectory modifies the content of onother!

to support c++11 begin,end and operator++ has been added with the same semantics of rbegin,rend and operator-- Highly confusing, still the bqueue is a sort of reversed slist: provided the user knows should work....

Function Documentation

intrusive_ptr_add_ref()

template<class T >

void cmsutils::intrusive_ptr_add_ref

(

_bqueue_item< T > *

it

)

Definition at line 77 of file bqueue.h.

                                                         {
    it->addRef();
  }

References cmsutils::_bqueue_item< T >::addRef().

intrusive_ptr_release()

template<class T >

void cmsutils::intrusive_ptr_release

(

_bqueue_item< T > *

it

)

Definition at line 81 of file bqueue.h.

                                                         {
    it->delRef();
  }

References cmsutils::_bqueue_item< T >::delRef().

swap()

template<typename T >

void cmsutils::swap	(	bqueue< T > &	rh,
		bqueue< T > &	lh
	)

Definition at line 246 of file bqueue.h.

                                          {
    rh.swap(lh);
  }

References mathSSE::lh, and cmsutils::bqueue< T >::swap().