Log of /trunk/tree/tree/src/TEntryListArray.cxx

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Revision 43993 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Fri Apr 27 16:23:16 2012 UTC (2 years, 8 months ago) by pcanal
File length: 25641 byte(s)
Diff to previous 40663

Fix coverity issues
Dereference null return:
32943,32945,36325,36329: TFormLeafInfo::GetLocalValuePointer
33253: TTreeFormula::EvalObject
33763: CloneTree
33258: GetBasket
34034: In DropBuffers (in addition avoid reading the basket when the intend is to drop the content from memory!)
36307: TTree::BuildIndex
36328: DrawCopy
36332: GetStreamerInfoCache
33025: BuildStreamerInfo
42469: Clone
33436: MakeIterator
Dereference after null check.
42470: in ImportStreamerInfo
33138: in TEntryListArray::Enter
Unchecked return value:
32049, 32050: TBranchProxy::Read and Setup
Mixed enums:
32705,32706: TClass::fStreamerType (and also name the enum type).

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Revision 40663 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Aug 22 20:01:47 2011 UTC (3 years, 5 months ago) by pcanal
File length: 25634 byte(s)
Diff to previous 40643

Fix coverity #29899 through 29904: unchecked dynamic_cast

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Revision 40643 - (view) (download) (as text) (annotate) - [select for diffs]
Added Fri Aug 19 19:27:05 2011 UTC (3 years, 5 months ago) by pcanal
File length: 25129 byte(s)

From Bruno Lenzi: TEntryListArray

TEntryListArray is an extension of TEntryList, used to hold selected entries and subentries (sublists) of a TTree. It is useful in case of a TTree with containers (vectors, arrays, ...). A typical example is the case when each entry of a TTree corresponds to physics events and each subentry (index of arrays) represents a particle.

Its main purpose is to improve the performance of a code that needs to apply complex selections (cuts) on TTree::Draw multiple times. Evaluating such cuts can be time consuming for large trees due to the need for loading the associated information (branches). This operation is done once with the use of a TEntryListArray. Subsequent calls to TTree::Draw only need to load the requested branches for histogramming, while using only the entries and subentries that satisfied the previous selection.

TTree/TSelectorDraw: use of TEntryListArray to select entries and subentries. If the option "entrylistarray" is specified, a TEntryListArray is created and filled with the entries and subentries that pass the given selection. If TTree::Draw is called after a TEntryList is set, only the selected entries and subentries are used to fill histograms or create new entrylists.