ROOT::Experimental::RNTupleModel::RUpdater Class Reference

A model is usually immutable after passing it to an RNTupleWriter.

However, for the rare cases that require changing the model after the fact, RUpdater provides limited support for incremental updates, e.g. addition of new fields.

See RNTupleWriter::CreateModelUpdater() for an example.

Definition at line 162 of file RNTupleModel.hxx.

Public Member Functions
	RUpdater (RNTupleWriter &writer)
	~RUpdater ()
void	AddField (std::unique_ptr< RFieldBase > field)
RResult< void >	AddProjectedField (std::unique_ptr< RFieldBase > field, FieldMappingFunc_t mapping)
void	BeginUpdate ()
	Begin a new set of alterations to the underlying model.
void	CommitUpdate ()
	Commit changes since the last call to BeginUpdate().
template<typename T , typename... ArgsT>
std::shared_ptr< T >	MakeField (const NameWithDescription_t &fieldNameDesc, ArgsT &&...args)

Private Attributes
std::uint64_t	fNewModelId = 0
	The model ID after committing.
Internal::RNTupleModelChangeset	fOpenChangeset
RNTupleWriter &	fWriter

#include <ROOT/RNTupleModel.hxx>

Constructor & Destructor Documentation

RUpdater()

ROOT::Experimental::RNTupleModel::RUpdater::RUpdater ( RNTupleWriter & writer )

explicit

Definition at line 166 of file RNTupleModel.cxx.

~RUpdater()

ROOT::Experimental::RNTupleModel::RUpdater::~RUpdater ( )

inline

Definition at line 170 of file RNTupleModel.hxx.

Member Function Documentation

AddField()

void ROOT::Experimental::RNTupleModel::RUpdater::AddField

(

std::unique_ptr< RFieldBase >

field

)

Definition at line 191 of file RNTupleModel.cxx.

AddProjectedField()

ROOT::Experimental::RResult< void > ROOT::Experimental::RNTupleModel::RUpdater::AddProjectedField	(	std::unique_ptr< RFieldBase >	field,
		FieldMappingFunc_t	mapping )

Definition at line 199 of file RNTupleModel.cxx.

BeginUpdate()

void ROOT::Experimental::RNTupleModel::RUpdater::BeginUpdate

(

)

Begin a new set of alterations to the underlying model.

As a side effect, all REntry instances related to the model are invalidated.

Definition at line 171 of file RNTupleModel.cxx.

CommitUpdate()

void ROOT::Experimental::RNTupleModel::RUpdater::CommitUpdate

(

)

Commit changes since the last call to BeginUpdate().

All the invalidated REntrys remain invalid. CreateEntry() or CreateBareEntry() can be used to create an REntry that matching the new model. Upon completion, BeginUpdate() can be called again to begin a new set of changes.

Definition at line 179 of file RNTupleModel.cxx.

MakeField()

template<typename T , typename... ArgsT>

std::shared_ptr< T > ROOT::Experimental::RNTupleModel::RUpdater::MakeField ( const NameWithDescription_t & fieldNameDesc, ArgsT &&... args )

inline

Definition at line 180 of file RNTupleModel.hxx.

Member Data Documentation

fNewModelId

std::uint64_t ROOT::Experimental::RNTupleModel::RUpdater::fNewModelId = 0

private

The model ID after committing.

Definition at line 166 of file RNTupleModel.hxx.

fOpenChangeset

Internal::RNTupleModelChangeset ROOT::Experimental::RNTupleModel::RUpdater::fOpenChangeset

private

Definition at line 165 of file RNTupleModel.hxx.

fWriter

RNTupleWriter& ROOT::Experimental::RNTupleModel::RUpdater::fWriter

private

Definition at line 164 of file RNTupleModel.hxx.

Libraries for ROOT::Experimental::RNTupleModel::RUpdater:

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

• tree/ntuple/v7/inc/ROOT/RNTupleModel.hxx
• tree/ntuple/v7/src/RNTupleModel.cxx