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Reference Guide
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TTree::TClusterIterator Class Reference

Helper class to iterate over cluster of baskets.

Definition at line 235 of file TTree.h.

Public Member Functions

Long64_t GetNextEntry ()
Long64_t GetStartEntry ()
Long64_t Next ()
 Move on to the next cluster and return the starting entry of this next cluster. More...
Long64_t operator() ()
Long64_t Previous ()
 Move on to the previous cluster and return the starting entry of this previous cluster. More...

Protected Member Functions

 TClusterIterator (TTree *tree, Long64_t firstEntry)
 Regular constructor. More...

Private Member Functions

Long64_t GetEstimatedClusterSize ()
 Estimate the cluster size. More...

Private Attributes

Int_t fClusterRange
Long64_t fEstimatedSize
Long64_t fNextEntry
Long64_t fStartEntry


class TTree

#include <TTree.h>

Constructor & Destructor Documentation

◆ TClusterIterator()

TTree::TClusterIterator::TClusterIterator ( TTree tree,
Long64_t  firstEntry 

Regular constructor.

TTree is not set as const, since we might modify if it is a TChain.

Definition at line 526 of file TTree.cxx.

Member Function Documentation

◆ GetEstimatedClusterSize()

Long64_t TTree::TClusterIterator::GetEstimatedClusterSize ( )

Estimate the cluster size.

In almost all cases, this quickly returns the size of the auto-flush in the TTree.

However, in the case where the cluster size was not fixed (old files and case where autoflush was explicitly set to zero), we need estimate a cluster size in relation to the size of the cache.

After this value is calculated once for the TClusterIterator, it is cached and reused in future calls.

Definition at line 577 of file TTree.cxx.

◆ GetNextEntry()

Long64_t TTree::TClusterIterator::GetNextEntry ( )

Definition at line 273 of file TTree.h.

◆ GetStartEntry()

Long64_t TTree::TClusterIterator::GetStartEntry ( )

Definition at line 268 of file TTree.h.

◆ Next()

Long64_t TTree::TClusterIterator::Next ( )

Move on to the next cluster and return the starting entry of this next cluster.

Definition at line 614 of file TTree.cxx.

◆ operator()()

Long64_t TTree::TClusterIterator::operator() ( )

Definition at line 277 of file TTree.h.

◆ Previous()

Long64_t TTree::TClusterIterator::Previous ( )

Move on to the previous cluster and return the starting entry of this previous cluster.

Definition at line 658 of file TTree.cxx.

Friends And Related Function Documentation

◆ TTree

friend class TTree

Definition at line 247 of file TTree.h.

Member Data Documentation

◆ fClusterRange

Int_t TTree::TClusterIterator::fClusterRange

Definition at line 239 of file TTree.h.

◆ fEstimatedSize

Long64_t TTree::TClusterIterator::fEstimatedSize

Definition at line 242 of file TTree.h.

◆ fNextEntry

Long64_t TTree::TClusterIterator::fNextEntry

Definition at line 241 of file TTree.h.

◆ fStartEntry

Long64_t TTree::TClusterIterator::fStartEntry

Definition at line 240 of file TTree.h.

◆ fTree

TTree* TTree::TClusterIterator::fTree

Definition at line 238 of file TTree.h.

Libraries for TTree::TClusterIterator:

The documentation for this class was generated from the following files: