ROOT::Experimental::RNTupleView< T > Class Template Reference

template<typename T>
class ROOT::Experimental::RNTupleView< T >

An RNTupleView provides read-only access to a single field of the ntuple

The view owns a field and its underlying columns in order to fill an ntuple value object with data. Data can be accessed by index. For top level fields, the index refers to the entry number. Fields that are part of nested collections have global index numbers that are derived from their parent indexes.

Fields of simple types with a Map() method will use that and thus expose zero-copy access.

Definition at line 140 of file RNTupleView.hxx.

Public Member Functions
	RNTupleView (const RNTupleView &other)=delete
	RNTupleView (RNTupleView &&other)=default
	~RNTupleView ()
RNTupleGlobalRange	GetFieldRange () const
template<typename C = T>
std::enable_if_t< Internal::IsMappable< FieldT >::value, const C & >	operator() (NTupleSize_t globalIndex)
template<typename C = T>
std::enable_if_t<!Internal::IsMappable< FieldT >::value, const C & >	operator() (NTupleSize_t globalIndex)
template<typename C = T>
std::enable_if_t< Internal::IsMappable< FieldT >::value, const C & >	operator() (const RClusterIndex &clusterIndex)
template<typename C = T>
std::enable_if_t<!Internal::IsMappable< FieldT >::value, const C & >	operator() (const RClusterIndex &clusterIndex)
RNTupleView &	operator= (const RNTupleView &other)=delete
RNTupleView &	operator= (RNTupleView &&other)=default

Private Types
using	FieldT = RField< T >

Private Member Functions
	RNTupleView (DescriptorId_t fieldId, Detail::RPageSource *pageSource)

Private Attributes
FieldT	fField
	fFieldId has fParent always set to null; views access nested fields without looking at the parent More...
Detail::RFieldValue	fValue
	Used as a Read() destination for fields that are not mappable. More...

Friends
class	RNTupleReader
class	RNTupleViewCollection

#include <ROOT/RNTupleView.hxx>

Member Typedef Documentation

FieldT

template<typename T>

using ROOT::Experimental::RNTupleView< T >::FieldT = RField<T>

private

Definition at line 144 of file RNTupleView.hxx.

Constructor & Destructor Documentation

RNTupleView() [1/3]

template<typename T>

ROOT::Experimental::RNTupleView< T >::RNTupleView ( DescriptorId_t  fieldId, Detail::RPageSource *  pageSource  )

inlineprivate

Definition at line 152 of file RNTupleView.hxx.

RNTupleView() [2/3]

template<typename T>

ROOT::Experimental::RNTupleView< T >::RNTupleView ( const RNTupleView< T > &  other )

delete

RNTupleView() [3/3]

template<typename T>

ROOT::Experimental::RNTupleView< T >::RNTupleView ( RNTupleView< T > &&  other )

default

~RNTupleView()

template<typename T>

ROOT::Experimental::RNTupleView< T >::~RNTupleView ( )

inline

Definition at line 170 of file RNTupleView.hxx.

Member Function Documentation

GetFieldRange()

template<typename T>

RNTupleGlobalRange ROOT::Experimental::RNTupleView< T >::GetFieldRange ( ) const

inline

Definition at line 172 of file RNTupleView.hxx.

operator()() [1/4]

template<typename T>

template<typename C = T>

std::enable_if_t<Internal::IsMappable<FieldT>::value, const C&> ROOT::Experimental::RNTupleView< T >::operator() ( NTupleSize_t  globalIndex )

inline

Definition at line 176 of file RNTupleView.hxx.

operator()() [2/4]

template<typename T>

template<typename C = T>

std::enable_if_t<!Internal::IsMappable<FieldT>::value, const C&> ROOT::Experimental::RNTupleView< T >::operator() ( NTupleSize_t  globalIndex )

inline

Definition at line 180 of file RNTupleView.hxx.

operator()() [3/4]

template<typename T>

template<typename C = T>

std::enable_if_t<Internal::IsMappable<FieldT>::value, const C&> ROOT::Experimental::RNTupleView< T >::operator() ( const RClusterIndex &  clusterIndex )

inline

Definition at line 187 of file RNTupleView.hxx.

operator()() [4/4]

template<typename T>

template<typename C = T>

std::enable_if_t<!Internal::IsMappable<FieldT>::value, const C&> ROOT::Experimental::RNTupleView< T >::operator() ( const RClusterIndex &  clusterIndex )

inline

Definition at line 191 of file RNTupleView.hxx.

operator=() [1/2]

template<typename T>

RNTupleView& ROOT::Experimental::RNTupleView< T >::operator= ( const RNTupleView< T > &  other )

delete

operator=() [2/2]

template<typename T>

RNTupleView& ROOT::Experimental::RNTupleView< T >::operator= ( RNTupleView< T > &&  other )

default

Friends And Related Function Documentation

RNTupleReader

template<typename T>

friend class RNTupleReader

friend

Definition at line 141 of file RNTupleView.hxx.

RNTupleViewCollection

template<typename T>

friend class RNTupleViewCollection

friend

Definition at line 142 of file RNTupleView.hxx.

Member Data Documentation

fField

template<typename T>

FieldT ROOT::Experimental::RNTupleView< T >::fField

private

fFieldId has fParent always set to null; views access nested fields without looking at the parent

Definition at line 148 of file RNTupleView.hxx.

fValue

template<typename T>

Detail::RFieldValue ROOT::Experimental::RNTupleView< T >::fValue

private

Used as a Read() destination for fields that are not mappable.

Definition at line 150 of file RNTupleView.hxx.

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

• tree/ntuple/v7/inc/ROOT/RNTupleView.hxx