Tree Library

To store large quantities of same-class objects, ROOT provides the TTree and TNtuple classes.

The TTree class is optimized to reduce disk space and enhance access speed. A TNtuple is a TTree that is limited to only hold floating-point numbers; a TTree on the other hand can hold all kind of data, such as objects or arrays in addition to all the simple types.

Classes
class	TBasket
	Manages buffers for branches of a Tree. More...
class	TBasketSQL
	Implement TBasket for a SQL backend. More...
class	TBranch
	A TTree is a list of TBranches. More...
class	TBranchClones
	A Branch for the case of an array of clone objects. More...
class	TBranchElement
	A Branch for the case of an object. More...
class	TBranchObject
	A Branch for the case of an object. More...
class	TBranchRef
	A branch containing and managing a TRefTable for TRef autoloading. More...
class	TBranchSTL
	A Branch handling STL collection of pointers (vectors, lists, queues, sets and multisets) while storing them in split mode. More...
class	TBufferSQL
	Implement TBuffer for a SQL backend. More...
class	TChain
	A chain is a collection of files containing TTree objects. More...
class	TChainElement
	A TChainElement describes a component of a TChain. More...
class	TCollectionMethodBrowsable
	TCollectionMethodBrowsable extends TCollectionPropertyBrowsable by showing all methods of the collection itself. More...
class	TCollectionPropertyBrowsable
	A tiny browser helper object (and its generator) for adding a virtual (as in "not actually part of the class", not in C++ virtual) "@size()" method to a collection. More...
class	TCut
	A specialized string object used for TTree selections. More...
class	TEntryList
	A List of entry numbers in a TTree or TChain. More...
class	TEntryListArray
	A list of entries and subentries in a TTree or TChain. More...
class	TEntryListBlock
	Used by TEntryList to store the entry numbers. More...
class	TEntryListFromFile
	Manages entry lists from different files, when they are not loaded in memory at the same time. More...
class	TEventList
	A TEventList object is a list of selected events (entries) in a TTree. More...
class	TFriendElement
	A TFriendElement TF describes a TTree object TF in a file. More...
class	TLeaf
	A TLeaf describes individual elements of a TBranch See TBranch structure in TTree. More...
class	TLeafB
	A TLeaf for an 8 bit Integer data type. More...
class	TLeafC
	A TLeaf for a variable length string. More...
class	TLeafD
	A TLeaf for a 64 bit floating point data type. More...
class	TLeafElement
	A TLeaf for the general case when using the branches created via a TStreamerInfo (i.e. More...
class	TLeafF
	A TLeaf for a 32 bit floating point data type. More...
class	TLeafI
	A TLeaf for an Integer data type. More...
class	TLeafL
	A TLeaf for a 64 bit Integer data type. More...
class	TLeafO
	A TLeaf for a bool data type. More...
class	TLeafObject
	A TLeaf for a general object derived from TObject. More...
class	TLeafS
	A TLeaf for a 16 bit Integer data type. More...
class	TMethodBrowsable
	This helper object allows the browsing of methods of objects stored in branches. More...
class	TNonSplitBrowsable
	Allows a TBrowser to browse non-split branches as if they were split. More...
class	TNtuple
	A simple TTree restricted to a list of float variables only. More...
class	TNtupleD
	A simple TTree restricted to a list of double variables only. More...
class	TQueryResult
	A container class for query results. More...
class	TSelector
	A TSelector object is used by the TTree::Draw, TTree::Scan, TTree::Process to navigate in a TTree and make selections. More...
class	TSelectorCint
	This class is a special version of TSelector for user interpreted classes. More...
class	TSelectorList
	A TList derived class that makes sure that objects added to it are not linked to the currently open file (like histograms, eventlists and trees). More...
class	TSelectorScalar
	Named scalar type, based on Long64_t, streamable, storable and mergable. More...
class	TTree
	A TTree object has a header with a name and a title. More...
class	TTreeCache
	A specialized TFileCacheRead object for a TTree. More...
class	TTreeCacheUnzip
	Specialization of TTreeCache for parallel Unzipping. More...
class	TTreeCloner
	Class implementing or helping the various TTree cloning method. More...
class	TTreeResult
	Class defining interface to a TTree query result with the same interface as for SQL databases. More...
class	TTreeRow
	Class defining interface to a row of a TTree query result. More...
class	TTreeSQL
	Implement TTree for a SQL backend. More...
class	TVirtualBranchBrowsable
	TVirtualBranchBrowsable is a base class (not really abstract, but useless by itself) for helper objects that extend TBranch's browsing support. More...
class	TVirtualIndex
	Abstract interface for Tree Index. More...
class	TVirtualTreePlayer
	Abstract base class defining the interface for the plugins that implement Draw, Scan, Process, MakeProxy, etc. More...