Tree Library

In order to store columnar datasets, ROOT provides the TTree, TChain, TNtuple and TNtupleD classes. The TTree class represents a columnar dataset. Any C++ type can be stored in the columns. The TTree has allowed to store about 1 EB of data coming from the LHC alone: it is demonstrated to scale and it's battle tested. It has been optimized during the years to reduce dataset sizes on disk and to deliver excellent runtime performance. It allows to access only part of the columns of the datasets, too. The TNtuple and TNtupleD classes are specialisations of the TTree class which can only hold single precision and double precision floating-point numbers respectively; The TChain is a collection of TTrees, which can be located also in different files.

Classes
class	TBasket
class	TBasketSQL
class	TBranch
class	TBranchClones
class	TBranchElement
class	TBranchObject
class	TBranchRef
class	TBranchSTL
class	TBufferSQL
class	TChain
class	TChainElement
class	TCollectionMethodBrowsable
class	TCollectionPropertyBrowsable
class	TCut
class	TEntryList
class	TEntryListArray
class	TEntryListBlock
class	TEntryListFromFile
class	TEventList
class	TFriendElement
class	ROOT::TIOFeatures
class	TLeaf
class	TLeafB
class	TLeafC
class	TLeafD
class	TLeafD32
class	TLeafElement
class	TLeafF
class	TLeafF16
class	TLeafI
class	TLeafL
class	TLeafO
class	TLeafObject
class	TLeafS
class	TMethodBrowsable
class	TNonSplitBrowsable
class	TNtuple
class	TNtupleD
class	TQueryResult
class	TSelector
class	TSelectorList
class	TSelectorScalar
class	TTree
class	TTreeCache
	A cache to speed-up the reading of ROOT datasets. More...
class	TTreeCacheUnzip
class	TTreeCloner
class	TTreeResult
class	TTreeRow
class	TTreeSQL
class	TVirtualBranchBrowsable
class	TVirtualIndex
class	TVirtualTreePlayer