TTreeReaderValue< T > Class Template Reference

template<typename T>
class TTreeReaderValue< T >

Extracts data from a TTree.

Definition at line 128 of file TTreeReaderValue.h.

Public Types
using	NonConstT_t = typename std::remove_const< T >::type
Public Types inherited from ROOT::Internal::TTreeReaderValueBase
enum	EReadStatus { kReadSuccess = 0, kReadNothingYet, kReadError }
enum	ESetupStatus {   kSetupNotSetup = -7, kSetupTreeDestructed = -8, kSetupMakeClassModeMismatch = -7, kSetupMissingCounterBranch = -6,   kSetupMissingBranch = -5, kSetupInternalError = -4, kSetupMissingDictionary = -3, kSetupMismatch = -2,   kSetupNotACollection = -1, kSetupMatch = 0, kSetupMatchBranch = 0, kSetupNoCheck = 5,   kSetupMatchLeaf = 6 }

Public Member Functions
	TTreeReaderValue ()=delete
	TTreeReaderValue (TTreeReader &tr, const char *branchname)
T *	Get ()
	Return a pointer to the value of the current entry. More...
T &	operator* ()
	Return a reference to the value of the current entry. More...
T *	operator-> ()
	Return a pointer to the value of the current entry. More...
Public Member Functions inherited from ROOT::Internal::TTreeReaderValueBase
virtual	~TTreeReaderValueBase ()
	Unregister from tree reader, cleanup. More...
void *	GetAddress ()
	Returns the memory address of the object being read. More...
const char *	GetBranchName () const
TLeaf *	GetLeaf ()
	If we are reading a leaf, return the corresponding TLeaf. More...
virtual EReadStatus	GetReadStatus () const
ESetupStatus	GetSetupStatus () const
Bool_t	IsValid () const
EReadStatus	ProxyRead ()
	Try to read the value from the TBranchProxy, returns the status of the read. More...

Protected Member Functions
virtual const char *	GetDerivedTypeName () const
	Get the template argument as a string. More...
Protected Member Functions inherited from ROOT::Internal::TTreeReaderValueBase
	TTreeReaderValueBase (TTreeReader *reader, const char *branchname, TDictionary *dict)
	Construct a tree value reader and register it with the reader object. More...
	TTreeReaderValueBase (const TTreeReaderValueBase &)
	Copy-construct. More...
virtual void	CreateProxy ()
	Create the proxy object for our branch. More...
const char *	GetBranchDataType (TBranch *branch, TDictionary *&dict) const
	Retrieve the type of data stored by branch; put its dictionary into dict, return its type name. More...
Detail::TBranchProxy *	GetProxy () const
void	MarkTreeReaderUnavailable ()
void	NotifyNewTree (TTree *newTree)
	The TTreeReader has switched to a new TTree. Update the leaf. More...
TTreeReaderValueBase &	operator= (const TTreeReaderValueBase &)
	Copy-assign. More...
void	RegisterWithTreeReader ()
	Register with tree reader. More...
TBranch *	SearchBranchWithCompositeName (TLeaf *&myleaf, TDictionary *&branchActualType, std::string &err)
	Search a branch the name of which contains a ".". More...

Additional Inherited Members
Static Protected Member Functions inherited from ROOT::Internal::TTreeReaderValueBase
static std::string	GetElementTypeName (const std::type_info &ti)
	Stringify the template argument. More...
Protected Attributes inherited from ROOT::Internal::TTreeReaderValueBase
TString	fBranchName
TDictionary *	fDict
int	fHaveLeaf: 1
int	fHaveStaticClassOffsets: 1
TLeaf *	fLeaf = nullptr
TString	fLeafName
Detail::TBranchProxy *	fProxy = nullptr
EReadStatus	fReadStatus: 2
ESetupStatus	fSetupStatus = kSetupNotSetup
std::vector< Long64_t >	fStaticClassOffsets
TTreeReader *	fTreeReader

#include <TTreeReaderValue.h>

Inheritance diagram for TTreeReaderValue< T >:

Member Typedef Documentation

NonConstT_t

template<typename T>

using TTreeReaderValue< T >::NonConstT_t = typename std::remove_const<T>::type

Definition at line 130 of file TTreeReaderValue.h.

Constructor & Destructor Documentation

TTreeReaderValue() [1/2]

template<typename T>

TTreeReaderValue< T >::TTreeReaderValue ( )

delete

TTreeReaderValue() [2/2]

template<typename T>

TTreeReaderValue< T >::TTreeReaderValue ( TTreeReader &  tr, const char *  branchname  )

inline

Definition at line 132 of file TTreeReaderValue.h.

Member Function Documentation

Get()

template<typename T>

T* TTreeReaderValue< T >::Get ( )

inline

Return a pointer to the value of the current entry.

Return a nullptr and print an error if no entry has been loaded yet. The returned address is guaranteed to stay constant while a given TTree is being read from a given file, unless the branch addresses are manipulated directly (e.g. through TTree::SetBranchAddress()). The address might also change when the underlying TTree/TFile is switched, e.g. when a TChain switches files.

Definition at line 141 of file TTreeReaderValue.h.

GetDerivedTypeName()

template<typename T>

virtual const char* TTreeReaderValue< T >::GetDerivedTypeName ( ) const

inlineprotectedvirtual

Get the template argument as a string.

Implements ROOT::Internal::TTreeReaderValueBase.

Definition at line 159 of file TTreeReaderValue.h.

operator*()

template<typename T>

T& TTreeReaderValue< T >::operator* ( )

inline

Return a reference to the value of the current entry.

Equivalent to dereferencing the pointer returned by Get(). Behavior is undefined if no entry has been loaded yet. Most likely a crash will occur.

Definition at line 154 of file TTreeReaderValue.h.

operator->()

template<typename T>

T* TTreeReaderValue< T >::operator-> ( )

inline

Return a pointer to the value of the current entry.

Equivalent to Get().

Definition at line 150 of file TTreeReaderValue.h.

Libraries for TTreeReaderValue< T >:

[legend]