ROOT::Experimental::TDF::TArrayBranch< T > Class Template Reference

template<typename T>
class ROOT::Experimental::TDF::TArrayBranch< T >

When using TDataFrame to read data from a ROOT file, users can specify that the type of a branch is TArrayBranch<T> to indicate the branch is a c-style array, an STL array or any other type that can/must be accessed through a TTreeReaderArray<T> (as opposed to a TTreeReaderValue<T>).

Column values of type TArrayBranch perform no copy of the underlying array data and offer a minimal array-like interface to access the array elements: either via square brackets, or with C++11 range-based for loops.

Definition at line 26 of file TArrayBranch.hxx.

Public Types
using	const_iterator = typename TTreeReaderArray< T >::const_iterator
using	iterator = typename TTreeReaderArray< T >::iterator
using	value_type = T

Public Member Functions
	TArrayBranch ()
	TArrayBranch (TTreeReaderArray< T > &arr)
iterator	begin ()
const_iterator	begin () const
iterator	end ()
const_iterator	end () const
T *	GetData ()
const T &	operator[] (std::size_t n) const
std::size_t	size () const

Private Attributes
TTreeReaderArray< T > *	fReaderArray = nullptr
	Pointer to the TTreeReaderArray that actually owns the data. More...

#include <ROOT/TArrayBranch.hxx>

Member Typedef Documentation

const_iterator

template<typename T>

using ROOT::Experimental::TDF::TArrayBranch< T >::const_iterator = typename TTreeReaderArray<T>::const_iterator

Definition at line 30 of file TArrayBranch.hxx.

iterator

template<typename T>

using ROOT::Experimental::TDF::TArrayBranch< T >::iterator = typename TTreeReaderArray<T>::iterator

Definition at line 29 of file TArrayBranch.hxx.

value_type

template<typename T>

using ROOT::Experimental::TDF::TArrayBranch< T >::value_type = T

Definition at line 31 of file TArrayBranch.hxx.

Constructor & Destructor Documentation

TArrayBranch() [1/2]

template<typename T>

ROOT::Experimental::TDF::TArrayBranch< T >::TArrayBranch ( )

inline

Definition at line 33 of file TArrayBranch.hxx.

TArrayBranch() [2/2]

template<typename T>

ROOT::Experimental::TDF::TArrayBranch< T >::TArrayBranch ( TTreeReaderArray< T > &  arr )

inline

Definition at line 34 of file TArrayBranch.hxx.

Member Function Documentation

begin() [1/2]

template<typename T>

iterator ROOT::Experimental::TDF::TArrayBranch< T >::begin ( )

inline

Definition at line 50 of file TArrayBranch.hxx.

begin() [2/2]

template<typename T>

const_iterator ROOT::Experimental::TDF::TArrayBranch< T >::begin ( ) const

inline

Definition at line 52 of file TArrayBranch.hxx.

end() [1/2]

template<typename T>

iterator ROOT::Experimental::TDF::TArrayBranch< T >::end ( )

inline

Definition at line 51 of file TArrayBranch.hxx.

end() [2/2]

template<typename T>

const_iterator ROOT::Experimental::TDF::TArrayBranch< T >::end ( ) const

inline

Definition at line 53 of file TArrayBranch.hxx.

GetData()

template<typename T>

T* ROOT::Experimental::TDF::TArrayBranch< T >::GetData ( void  )

inline

Definition at line 48 of file TArrayBranch.hxx.

operator[]()

template<typename T>

const T& ROOT::Experimental::TDF::TArrayBranch< T >::operator[] ( std::size_t  n ) const

inline

Definition at line 45 of file TArrayBranch.hxx.

size()

template<typename T>

std::size_t ROOT::Experimental::TDF::TArrayBranch< T >::size ( ) const

inline

Definition at line 55 of file TArrayBranch.hxx.

Member Data Documentation

fReaderArray

template<typename T>

TTreeReaderArray<T>* ROOT::Experimental::TDF::TArrayBranch< T >::fReaderArray = nullptr

private

Pointer to the TTreeReaderArray that actually owns the data.

Definition at line 27 of file TArrayBranch.hxx.

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

• tree/treeplayer/inc/ROOT/TArrayBranch.hxx