A field translates read and write calls from/to underlying columns to/from tree values.

A field is a serializable C++ type or a container for a collection of sub fields. The RFieldBase and its type-safe descendants provide the object to column mapper. They map C++ objects to primitive columns. The mapping is trivial for simple types such as 'double'. Complex types resolve to multiple primitive columns. The field knows based on its type and the field name the type(s) and name(s) of the columns.

Note: the class hierarchy starting at RFieldBase is not meant to be extended by user-provided child classes. This is and can only be partially enforced through C++.

Definition at line 83 of file RFieldBase.hxx.

Classes
class	RBulk
	Similar to RValue but manages an array of consecutive values. More...

struct	RBulkSpec

struct	RCheckResult
	Used in the return value of the Check() method. More...

class	RColumnRepresentations
	Some fields have multiple possible column representations, e.g. More...

struct	RCreateObjectDeleter

class	RDeleter
	A functor to release the memory acquired by CreateValue (memory and constructor). More...

class	RSchemaIteratorTemplate
	Iterates over the sub tree of fields in depth-first search order. More...

struct	RSharedPtrDeleter

class	RTypedDeleter
	A deleter for templated RFieldBase descendents where the value type is known. More...

class	RValue
	Points to an object with RNTuple I/O support and keeps a pointer to the corresponding field. More...

Public Types
enum	{ kTraitTriviallyConstructible = 0x01 , kTraitTriviallyDestructible = 0x02 , kTraitMappable = 0x04 , kTraitTypeChecksum = 0x08 , kTraitInvalidField = 0x10 , kTraitEmulatedField = 0x20 , kTraitTrivialType = kTraitTriviallyConstructible \| kTraitTriviallyDestructible }

using	ColumnRepresentation_t = std::vector<ROOT::ENTupleColumnType>

enum class	EState { kUnconnected , kConnectedToSink , kConnectedToSource }
	During its lifetime, a field undergoes the following possible state transitions: More...

using	RConstSchemaIterator = RSchemaIteratorTemplate<true>

using	RSchemaIterator = RSchemaIteratorTemplate<false>

Public Member Functions
	RFieldBase (const RFieldBase &)=delete

	RFieldBase (RFieldBase &&)=default

	RFieldBase (std::string_view name, std::string_view type, ROOT::ENTupleStructure structure, bool isSimple, std::size_t nRepetitions=0)
	The constructor creates the underlying column objects and connects them to either a sink or a source.

virtual	~RFieldBase ()=default

virtual void	AcceptVisitor (ROOT::Detail::RFieldVisitor &visitor) const

RSchemaIterator	begin ()

RConstSchemaIterator	begin () const

RValue	BindValue (std::shared_ptr< void > objPtr)
	Creates a value from a memory location with an already constructed object.

RConstSchemaIterator	cbegin () const

RConstSchemaIterator	cend () const

std::unique_ptr< RFieldBase >	Clone (std::string_view newName) const
	Copies the field and its sub fields using a possibly new name and a new, unconnected set of columns.

RBulk	CreateBulk ()
	The returned bulk is initially empty; RBulk::ReadBulk will construct the array of values.

template<>
std::unique_ptr< void, typename RFieldBase::RCreateObjectDeleter< void >::deleter >	CreateObject () const

template<typename T >
std::unique_ptr< T, typename RCreateObjectDeleter< T >::deleter >	CreateObject () const
	Generates an object of the field type and allocates new initialized memory according to the type.

template<>
std::unique_ptr< void, typename ROOT::RFieldBase::RCreateObjectDeleter< void >::deleter >	CreateObject () const

RValue	CreateValue ()
	Generates an object of the field type and wraps the created object in a shared pointer and returns it an RValue connected to the field.

RSchemaIterator	end ()

RConstSchemaIterator	end () const

virtual size_t	GetAlignment () const =0
	As a rule of thumb, the alignment is equal to the size of the type.

RColumnRepresentations::Selection_t	GetColumnRepresentatives () const
	Returns the fColumnRepresentative pointee or, if unset (always the case for artificial fields), the field's default representative.

std::vector< const RFieldBase * >	GetConstSubfields () const

const std::string &	GetDescription () const
	Get the field's description.

const std::string &	GetFieldName () const

virtual std::uint32_t	GetFieldVersion () const
	Indicates an evolution of the mapping scheme from C++ type to columns.

std::vector< RFieldBase * >	GetMutableSubfields ()

std::size_t	GetNRepetitions () const

ROOT::DescriptorId_t	GetOnDiskId () const

std::uint32_t	GetOnDiskTypeChecksum () const
	Return checksum stored in the field descriptor; only valid after a call to `ConnectPageSource()`, if the field stored a type checksum.

std::uint32_t	GetOnDiskTypeVersion () const
	Return the C++ type version stored in the field descriptor; only valid after a call to `ConnectPageSource()`

const RFieldBase *	GetParent () const

std::string	GetQualifiedFieldName () const
	Returns the field name and parent field names separated by dots ("grandparent.parent.child")

EState	GetState () const

ROOT::ENTupleStructure	GetStructure () const

std::uint32_t	GetTraits () const

const std::string &	GetTypeAlias () const

virtual std::uint32_t	GetTypeChecksum () const
	Return the current TClass reported checksum of this class. Only valid if kTraitTypeChecksum is set.

const std::string &	GetTypeName () const

virtual std::uint32_t	GetTypeVersion () const
	Indicates an evolution of the C++ type itself.

virtual size_t	GetValueSize () const =0
	The number of bytes taken by a value of the appropriate type.

bool	HasDefaultColumnRepresentative () const
	Whether or not an explicit column representative was set.

bool	HasReadCallbacks () const

bool	IsArtificial () const

bool	IsSimple () const

RFieldBase &	operator= (const RFieldBase &)=delete

RFieldBase &	operator= (RFieldBase &&)=default

void	SetColumnRepresentatives (const RColumnRepresentations::Selection_t &representatives)
	Fixes a column representative.

void	SetDescription (std::string_view description)

void	SetOnDiskId (ROOT::DescriptorId_t id)

virtual std::vector< RValue >	SplitValue (const RValue &value) const
	Creates the list of direct child values given a value for this field.

Static Public Member Functions
static std::vector< RCheckResult >	Check (const std::string &fieldName, const std::string &typeName)
	Checks if the given type is supported by RNTuple.

static RResult< std::unique_ptr< RFieldBase > >	Create (const std::string &fieldName, const std::string &typeName)
	Factory method to create a field from a certain type given as string.

Static Public Attributes
static constexpr std::uint32_t	kInvalidTypeVersion = -1U

Protected Member Functions
size_t	AddReadCallback (ReadCallback_t func)
	Set a user-defined function to be called after reading a value, giving a chance to inspect and/or modify the value object.

virtual void	AfterConnectPageSource ()
	Called by `ConnectPageSource()` once connected; derived classes may override this as appropriate.

std::size_t	Append (const void *from)
	Write the given value into columns.

virtual std::size_t	AppendImpl (const void *from)
	Operations on values of complex types, e.g.

void	Attach (std::unique_ptr< RFieldBase > child)
	Add a new subfield to the list of nested fields.

void	AutoAdjustColumnTypes (const ROOT::RNTupleWriteOptions &options)
	When connecting a field to a page sink, the field's default column representation is subject to adjustment according to the write options.

virtual void	BeforeConnectPageSource (ROOT::Experimental::Internal::RPageSource &)
	Called by `ConnectPageSource()` before connecting; derived classes may override this as appropriate.

virtual std::unique_ptr< RFieldBase >	CloneImpl (std::string_view newName) const =0
	Called by Clone(), which additionally copies the on-disk ID.

virtual void	CommitClusterImpl ()

virtual void	ConstructValue (void *where) const =0
	Constructs value in a given location of size at least GetValueSize(). Called by the base class' CreateValue().

void *	CreateObjectRawPtr () const
	Factory method for the field's type. The caller owns the returned pointer.

const ColumnRepresentation_t &	EnsureCompatibleColumnTypes (const ROOT::RNTupleDescriptor &desc, std::uint16_t representationIndex) const
	Returns the on-disk column types found in the provided descriptor for fOnDiskId and the given representation index.

virtual void	GenerateColumns ()
	Implementations in derived classes should create the backing columns corresponsing to the field type for writing.

virtual void	GenerateColumns (const ROOT::RNTupleDescriptor &)
	Implementations in derived classes should create the backing columns corresponsing to the field type for reading.

template<typename... ColumnCppTs>
void	GenerateColumnsImpl ()
	For writing, use the currently set column representative.

template<std::uint32_t ColumnIndexT, typename HeadT , typename... TailTs>
void	GenerateColumnsImpl (const ColumnRepresentation_t &representation, std::uint16_t representationIndex)
	Helpers for generating columns.

template<typename... ColumnCppTs>
void	GenerateColumnsImpl (const ROOT::RNTupleDescriptor &desc)
	For reading, use the on-disk column list.

virtual const RColumnRepresentations &	GetColumnRepresentations () const
	Implementations in derived classes should return a static RColumnRepresentations object.

virtual std::unique_ptr< RDeleter >	GetDeleter () const

virtual ROOT::RExtraTypeInfoDescriptor	GetExtraTypeInfo () const

virtual bool	HasExtraTypeInfo () const

void	Read (RNTupleLocalIndex localIndex, void *to)
	Populate a single value with data from the field.

void	Read (ROOT::NTupleSize_t globalIndex, void *to)
	Populate a single value with data from the field.

std::size_t	ReadBulk (const RBulkSpec &bulkSpec)
	Returns the number of newly available values, that is the number of bools in bulkSpec.fMaskAvail that flipped from false to true.

virtual std::size_t	ReadBulkImpl (const RBulkSpec &bulkSpec)
	General implementation of bulk read.

virtual void	ReadGlobalImpl (ROOT::NTupleSize_t globalIndex, void *to)

virtual void	ReadInClusterImpl (RNTupleLocalIndex localIndex, void *to)

void	RemoveReadCallback (size_t idx)

Static Protected Member Functions
static std::size_t	CallAppendOn (RFieldBase &other, const void *from)
	Allow derived classes to call Append and Read on other (sub) fields.

static void	CallConstructValueOn (const RFieldBase &other, void *where)
	Allow derived classes to call ConstructValue(void *) and GetDeleter on other (sub) fields.

static void *	CallCreateObjectRawPtrOn (RFieldBase &other)

static void	CallReadOn (RFieldBase &other, RNTupleLocalIndex localIndex, void *to)

static void	CallReadOn (RFieldBase &other, ROOT::NTupleSize_t globalIndex, void *to)

static RResult< std::unique_ptr< RFieldBase > >	Create (const std::string &fieldName, const std::string &typeName, const ROOT::RCreateFieldOptions &options, const ROOT::RNTupleDescriptor *desc, ROOT::DescriptorId_t fieldId)
	Factory method to resurrect a field from the stored on-disk type information.

static std::unique_ptr< RDeleter >	GetDeleterOf (const RFieldBase &other)

static ROOT::Internal::RColumn *	GetPrincipalColumnOf (const RFieldBase &other)
	Fields may need direct access to the principal column of their sub fields, e.g. in RRVecField::ReadBulk.

Protected Attributes
ROOT::Internal::RColumn *	fAuxiliaryColumn = nullptr
	Some fields have a second column in its column representation.

std::vector< std::unique_ptr< ROOT::Internal::RColumn > >	fAvailableColumns
	The columns are connected either to a sink or to a source (not to both); they are owned by the field.

std::vector< std::reference_wrapper< const ColumnRepresentation_t > >	fColumnRepresentatives
	Pointers into the static vector GetColumnRepresentations().GetSerializationTypes() when SetColumnRepresentatives is called.

std::uint32_t	fOnDiskTypeChecksum = 0
	TClass checksum cached from the descriptor after a call to `ConnectPageSource()`.

std::uint32_t	fOnDiskTypeVersion = kInvalidTypeVersion
	C++ type version cached from the descriptor after a call to `ConnectPageSource()`

RFieldBase *	fParent
	Sub fields point to their mother field.

ROOT::Internal::RColumn *	fPrincipalColumn = nullptr
	All fields that have columns have a distinct main column.

std::vector< ReadCallback_t >	fReadCallbacks
	List of functions to be called after reading a value.

std::vector< std::unique_ptr< RFieldBase > >	fSubfields
	Collections and classes own sub fields.

std::uint32_t	fTraits = 0
	Properties of the type that allow for optimizations of collections of that type.

std::string	fTypeAlias
	A typedef or using name that was used when creating the field.

Private Types
using	ReadCallback_t = std::function<void(void *)>

Private Member Functions
void	CommitCluster ()
	Flushes data from active columns to disk and calls CommitClusterImpl.

void	ConnectPageSink (ROOT::Experimental::Internal::RPageSink &pageSink, ROOT::NTupleSize_t firstEntry=0)
	Fields and their columns live in the void until connected to a physical page storage.

void	ConnectPageSource (ROOT::Experimental::Internal::RPageSource &pageSource)
	Connects the field and its sub field tree to the given page source.

ROOT::NTupleSize_t	EntryToColumnElementIndex (ROOT::NTupleSize_t globalIndex) const
	Translate an entry index to a column element index of the principal column and viceversa.

void	FlushColumns ()
	Flushes data from active columns.

void	InvokeReadCallbacks (void *target)

void	SetArtificial ()

Private Attributes
std::string	fDescription
	Free text set by the user.

bool	fIsArtificial = false
	A field that is not backed on disk but computed, e.g.

bool	fIsSimple
	A field qualifies as simple if it is mappable (which implies it has a single principal column), and it is not an artificial field and has no post-read callback.

std::string	fName
	The field name relative to its parent field.

std::size_t	fNRepetitions
	For fixed sized arrays, the array length.

ROOT::DescriptorId_t	fOnDiskId = ROOT::kInvalidDescriptorId
	When the columns are connected to a page source or page sink, the field represents a field id in the corresponding RNTuple descriptor.

EState	fState = EState::kUnconnected
	Changed by ConnectTo[Sink,Source], reset by Clone()

ROOT::ENTupleStructure	fStructure
	The role of this field in the data model structure.

std::string	fType
	The C++ type captured by this field.

Friends
void	Internal::CallCommitClusterOnField (RFieldBase &)

void	Internal::CallConnectPageSinkOnField (RFieldBase &, ROOT::Experimental::Internal::RPageSink &, ROOT::NTupleSize_t)

void	Internal::CallConnectPageSourceOnField (RFieldBase &, ROOT::Experimental::Internal::RPageSource &)

ROOT::RResult< std::unique_ptr< ROOT::RFieldBase > >	Internal::CallFieldBaseCreate (const std::string &fieldName, const std::string &typeName, const ROOT::RCreateFieldOptions &options, const ROOT::RNTupleDescriptor *desc, ROOT::DescriptorId_t fieldId)

void	Internal::CallFlushColumnsOnField (RFieldBase &)

class	ROOT::Experimental::RNTupleJoinProcessor

struct	ROOT::Internal::RFieldCallbackInjector

struct	ROOT::Internal::RFieldRepresentationModifier

class	ROOT::RClassField

#include <ROOT/RFieldBase.hxx>

Inheritance diagram for ROOT::RFieldBase:

[legend]

Member Typedef Documentation

◆ ColumnRepresentation_t

using ROOT::RFieldBase::ColumnRepresentation_t = std::vector<ROOT::ENTupleColumnType>

Definition at line 157 of file RFieldBase.hxx.

◆ RConstSchemaIterator

using ROOT::RFieldBase::RConstSchemaIterator = RSchemaIteratorTemplate<true>

Definition at line 501 of file RFieldBase.hxx.

◆ ReadCallback_t

using ROOT::RFieldBase::ReadCallback_t = std::function<void(void *)>

private

Definition at line 98 of file RFieldBase.hxx.

◆ RSchemaIterator

using ROOT::RFieldBase::RSchemaIterator = RSchemaIteratorTemplate<false>

Definition at line 500 of file RFieldBase.hxx.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
kTraitTriviallyConstructible	No constructor needs to be called, i.e. any bit pattern in the allocated memory represents a valid type A trivially constructible field has a no-op ConstructValue() implementation
kTraitTriviallyDestructible	The type is cleaned up just by freeing its memory. I.e. the destructor performs a no-op.
kTraitMappable	A field of a fundamental type that can be directly mapped via `RField<T>::Map()`, i.e. maps as-is to a single column
kTraitTypeChecksum	The TClass checksum is set and valid.
kTraitInvalidField	This field is an instance of RInvalidField and can be safely static_cast to it.
kTraitEmulatedField	This field is a user defined type that was missing dictionaries and was reconstructed from the on-disk information.
kTraitTrivialType	Shorthand for types that are both trivially constructible and destructible.

Definition at line 136 of file RFieldBase.hxx.

◆ EState

enum class ROOT::RFieldBase::EState

strong

During its lifetime, a field undergoes the following possible state transitions:

[*] --> Unconnected --> ConnectedToSink -— | | | | --> ConnectedToSource ---> [*]

| |

Enumerator
kUnconnected
kConnectedToSink
kConnectedToSource

Definition at line 166 of file RFieldBase.hxx.

Constructor & Destructor Documentation

◆ RFieldBase() [1/3]

ROOT::RFieldBase::RFieldBase	(	std::string_view	name,
		std::string_view	type,
		ROOT::ENTupleStructure	structure,
		bool	isSimple,
		std::size_t	nRepetitions = 0 )

The constructor creates the underlying column objects and connects them to either a sink or a source.

If isSimple is true, the trait kTraitMappable is automatically set on construction. However, the field might be demoted to non-simple if a post-read callback is set.

Definition at line 238 of file RFieldBase.cxx.

◆ RFieldBase() [2/3]

ROOT::RFieldBase::RFieldBase ( const RFieldBase & )

delete

◆ RFieldBase() [3/3]

ROOT::RFieldBase::RFieldBase ( RFieldBase && )

default

◆ ~RFieldBase()

virtual ROOT::RFieldBase::~RFieldBase ( )

virtualdefault

Member Function Documentation

◆ AcceptVisitor()

void ROOT::RFieldBase::AcceptVisitor ( ROOT::Detail::RFieldVisitor & visitor ) const

virtual

◆ AddReadCallback()

size_t ROOT::RFieldBase::AddReadCallback ( ReadCallback_t func )

protected

Set a user-defined function to be called after reading a value, giving a chance to inspect and/or modify the value object.

Returns an index that can be used to remove the callback.

Definition at line 911 of file RFieldBase.cxx.

◆ AfterConnectPageSource()

virtual void ROOT::RFieldBase::AfterConnectPageSource ( )

inlineprotectedvirtual

Called by ConnectPageSource() once connected; derived classes may override this as appropriate.

Reimplemented in ROOT::RField< TObject >.

Definition at line 488 of file RFieldBase.hxx.

◆ Append()

std::size_t ROOT::RFieldBase::Append ( const void * from )

protected

Write the given value into columns.

The value object has to be of the same type as the field. Returns the number of uncompressed bytes written.

Definition at line 780 of file RFieldBase.cxx.

◆ AppendImpl()

std::size_t ROOT::RFieldBase::AppendImpl ( const void * from )

protectedvirtual

Operations on values of complex types, e.g.

ones that involve multiple columns or for which no direct column type exists.

Reimplemented in ROOT::RClassField, ROOT::RStreamerField, ROOT::REnumField, ROOT::RField< TObject >, ROOT::RProxiedCollectionField, ROOT::RRecordField, ROOT::RArrayField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RAtomicField, ROOT::RBitsetField, ROOT::ROptionalField, ROOT::RUniquePtrField, and ROOT::RVariantField.

Definition at line 638 of file RFieldBase.cxx.

◆ Attach()

void ROOT::RFieldBase::Attach ( std::unique_ptr< RFieldBase > child )

protected

Add a new subfield to the list of nested fields.

Definition at line 693 of file RFieldBase.cxx.

◆ AutoAdjustColumnTypes()

void ROOT::RFieldBase::AutoAdjustColumnTypes ( const ROOT::RNTupleWriteOptions & options )

protected

When connecting a field to a page sink, the field's default column representation is subject to adjustment according to the write options.

E.g., if compression is turned off, encoded columns are changed to their unencoded counterparts.

Definition at line 924 of file RFieldBase.cxx.

◆ BeforeConnectPageSource()

virtual void ROOT::RFieldBase::BeforeConnectPageSource ( ROOT::Experimental::Internal::RPageSource & )

inlineprotectedvirtual

Called by ConnectPageSource() before connecting; derived classes may override this as appropriate.

Reimplemented in ROOT::RClassField.

Definition at line 485 of file RFieldBase.hxx.

◆ begin() [1/2]

ROOT::RFieldBase::RSchemaIterator ROOT::RFieldBase::begin ( )

Definition at line 811 of file RFieldBase.cxx.

◆ begin() [2/2]

ROOT::RFieldBase::RConstSchemaIterator ROOT::RFieldBase::begin ( ) const

Definition at line 821 of file RFieldBase.cxx.

◆ BindValue()

ROOT::RFieldBase::RValue ROOT::RFieldBase::BindValue ( std::shared_ptr< void > objPtr )

Creates a value from a memory location with an already constructed object.

Definition at line 794 of file RFieldBase.cxx.

◆ CallAppendOn()

static std::size_t ROOT::RFieldBase::CallAppendOn	(	RFieldBase &	other,
		const void *	from )

inlinestaticprotected

Allow derived classes to call Append and Read on other (sub) fields.

Definition at line 456 of file RFieldBase.hxx.

◆ CallConstructValueOn()

static void ROOT::RFieldBase::CallConstructValueOn	(	const RFieldBase &	other,
		void *	where )

inlinestaticprotected

Allow derived classes to call ConstructValue(void *) and GetDeleter on other (sub) fields.

Definition at line 396 of file RFieldBase.hxx.

◆ CallCreateObjectRawPtrOn()

static void * ROOT::RFieldBase::CallCreateObjectRawPtrOn ( RFieldBase & other )

inlinestaticprotected

Definition at line 459 of file RFieldBase.hxx.

◆ CallReadOn() [1/2]

static void ROOT::RFieldBase::CallReadOn	(	RFieldBase &	other,
		RNTupleLocalIndex	localIndex,
		void *	to )

inlinestaticprotected

Definition at line 457 of file RFieldBase.hxx.

◆ CallReadOn() [2/2]

static void ROOT::RFieldBase::CallReadOn	(	RFieldBase &	other,
		ROOT::NTupleSize_t	globalIndex,
		void *	to )

inlinestaticprotected

Definition at line 458 of file RFieldBase.hxx.

◆ cbegin()

ROOT::RFieldBase::RConstSchemaIterator ROOT::RFieldBase::cbegin ( ) const

Definition at line 831 of file RFieldBase.cxx.

◆ cend()

ROOT::RFieldBase::RConstSchemaIterator ROOT::RFieldBase::cend ( ) const

Definition at line 836 of file RFieldBase.cxx.

◆ Check()

std::vector< ROOT::RFieldBase::RCheckResult > ROOT::RFieldBase::Check	(	const std::string &	fieldName,
		const std::string &	typeName )

static

Checks if the given type is supported by RNTuple.

In case of success, the result vector is empty. Otherwise there is an error record for each failing sub field (sub type).

Definition at line 271 of file RFieldBase.cxx.

◆ Clone()

std::unique_ptr< ROOT::RFieldBase > ROOT::RFieldBase::Clone ( std::string_view newName ) const

Copies the field and its sub fields using a possibly new name and a new, unconnected set of columns.

Definition at line 627 of file RFieldBase.cxx.

◆ CloneImpl()

virtual std::unique_ptr< RFieldBase > ROOT::RFieldBase::CloneImpl ( std::string_view newName ) const

protectedpure virtual

◆ CommitCluster()

void ROOT::RFieldBase::CommitCluster ( )

private

Flushes data from active columns to disk and calls CommitClusterImpl.

Definition at line 749 of file RFieldBase.cxx.

◆ CommitClusterImpl()

virtual void ROOT::RFieldBase::CommitClusterImpl ( )

inlineprotectedvirtual

Reimplemented in ROOT::RStreamerField, ROOT::RProxiedCollectionField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RNullableField, and ROOT::RVariantField.

Definition at line 471 of file RFieldBase.hxx.

◆ ConnectPageSink()

void ROOT::RFieldBase::ConnectPageSink	(	ROOT::Experimental::Internal::RPageSink &	pageSink,
		ROOT::NTupleSize_t	firstEntry = 0 )

private

Fields and their columns live in the void until connected to a physical page storage.

Only once connected, data can be read or written. In order to find the field in the page storage, the field's on-disk ID has to be set.

Parameters

firstEntry The global index of the first entry with on-disk data for the connected field

Definition at line 950 of file RFieldBase.cxx.

◆ ConnectPageSource()

void ROOT::RFieldBase::ConnectPageSource ( ROOT::Experimental::Internal::RPageSource & pageSource )

private

Connects the field and its sub field tree to the given page source.

Once connected, data can be read. Only unconnected fields may be connected, i.e. the method is not idempotent. The field ID has to be set prior to calling this function. For sub fields, a field ID may or may not be set. If the field ID is unset, it will be determined using the page source descriptor, based on the parent field ID and the sub field name.

Definition at line 976 of file RFieldBase.cxx.

◆ ConstructValue()

virtual void ROOT::RFieldBase::ConstructValue ( void * where ) const

protectedpure virtual

◆ Create() [1/2]

ROOT::RResult< std::unique_ptr< ROOT::RFieldBase > > ROOT::RFieldBase::Create	(	const std::string &	fieldName,
		const std::string &	typeName )

static

Factory method to create a field from a certain type given as string.

Note that the provided type name must be a valid C++ type name. Template arguments of templated types must be type names or integers (e.g., no expressions).

Definition at line 264 of file RFieldBase.cxx.

◆ Create() [2/2]

ROOT::RResult< std::unique_ptr< ROOT::RFieldBase > > ROOT::RFieldBase::Create	(	const std::string &	fieldName,
		const std::string &	typeName,
		const ROOT::RCreateFieldOptions &	options,
		const ROOT::RNTupleDescriptor *	desc,
		ROOT::DescriptorId_t	fieldId )

staticprotected

Factory method to resurrect a field from the stored on-disk type information.

This overload takes an already normalized type name and type alias. desc and fieldId must be passed if options.fEmulateUnknownTypes is true, otherwise they can be left blank.

Definition at line 293 of file RFieldBase.cxx.

◆ CreateBulk()

ROOT::RFieldBase::RBulk ROOT::RFieldBase::CreateBulk ( )

The returned bulk is initially empty; RBulk::ReadBulk will construct the array of values.

Definition at line 789 of file RFieldBase.cxx.

◆ CreateObject() [1/3]

template<>

std::unique_ptr< void, typename RFieldBase::RCreateObjectDeleter< void >::deleter > ROOT::RFieldBase::CreateObject ( ) const

◆ CreateObject() [2/3]

template<typename T >

std::unique_ptr< T, typename RFieldBase::RCreateObjectDeleter< T >::deleter > ROOT::RFieldBase::CreateObject ( ) const

Generates an object of the field type and allocates new initialized memory according to the type.

Implemented at the end of this header because the implementation is using RField<T>::TypeName() The returned object can be released with delete, i.e. it is valid to call auto ptr = field->CreateObject(); delete ptr.release();

Note that CreateObject<void> is supported. The returned unique_ptr has a custom deleter that reports an error if it is called. The intended use of the returned unique_ptr<void> is to call release(). In this way, the transfer of pointer ownership is explicit.

Definition at line 506 of file RField.hxx.

◆ CreateObject() [3/3]

template<>

std::unique_ptr< void, typename ROOT::RFieldBase::RCreateObjectDeleter< void >::deleter > ROOT::RFieldBase::CreateObject ( ) const

Definition at line 223 of file RFieldBase.cxx.

◆ CreateObjectRawPtr()

void * ROOT::RFieldBase::CreateObjectRawPtr ( ) const

protected

Factory method for the field's type. The caller owns the returned pointer.

Definition at line 674 of file RFieldBase.cxx.

◆ CreateValue()

ROOT::RFieldBase::RValue ROOT::RFieldBase::CreateValue ( )

Generates an object of the field type and wraps the created object in a shared pointer and returns it an RValue connected to the field.

Definition at line 682 of file RFieldBase.cxx.

◆ end() [1/2]

ROOT::RFieldBase::RSchemaIterator ROOT::RFieldBase::end ( )

Definition at line 816 of file RFieldBase.cxx.

◆ end() [2/2]

ROOT::RFieldBase::RConstSchemaIterator ROOT::RFieldBase::end ( ) const

Definition at line 826 of file RFieldBase.cxx.

◆ EnsureCompatibleColumnTypes()

const ROOT::RFieldBase::ColumnRepresentation_t & ROOT::RFieldBase::EnsureCompatibleColumnTypes	(	const ROOT::RNTupleDescriptor &	desc,
		std::uint16_t	representationIndex ) const

protected

Returns the on-disk column types found in the provided descriptor for fOnDiskId and the given representation index.

If there are no columns for the given representation index, return an empty ColumnRepresentation_t list. Otherwise, the returned reference points into the static array returned by GetColumnRepresentations(). Throws an exception if the types on disk don't match any of the deserialization types from GetColumnRepresentations().

Definition at line 875 of file RFieldBase.cxx.

◆ EntryToColumnElementIndex()

ROOT::NTupleSize_t ROOT::RFieldBase::EntryToColumnElementIndex ( ROOT::NTupleSize_t globalIndex ) const

private

Translate an entry index to a column element index of the principal column and viceversa.

These functions take into account the role and number of repetitions on each level of the field hierarchy as follows:

Top level fields: element index == entry index
Record fields propagate their principal column index to the principal columns of direct descendant fields
Collection and variant fields set the principal column index of their childs to 0

The column element index also depends on the number of repetitions of each field in the hierarchy, e.g., given a field with type std::array<std::array<float, 4>, 2>, this function returns 8 for the inner-most field.

Definition at line 703 of file RFieldBase.cxx.

◆ FlushColumns()

void ROOT::RFieldBase::FlushColumns ( )

private

Flushes data from active columns.

Definition at line 737 of file RFieldBase.cxx.

◆ GenerateColumns() [1/2]

virtual void ROOT::RFieldBase::GenerateColumns ( )

inlineprotectedvirtual

Implementations in derived classes should create the backing columns corresponsing to the field type for writing.

The default implementation does not attach any columns to the field.

Reimplemented in ROOT::RArrayAsRVecField, ROOT::Experimental::Internal::RRDFCardinalityField, ROOT::Experimental::Internal::RArraySizeField, ROOT::RStreamerField, ROOT::RCardinalityField, ROOT::RRealField< T >, ROOT::RRealField< double >, ROOT::RRealField< float >, ROOT::RProxiedCollectionField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RArrayAsRVecField, ROOT::RBitsetField, ROOT::RNullableField, ROOT::RVariantField, ROOT::RSimpleField< T >, ROOT::RSimpleField< bool >, ROOT::RSimpleField< char >, ROOT::RSimpleField< double >, and ROOT::RSimpleField< float >.

Definition at line 371 of file RFieldBase.hxx.

◆ GenerateColumns() [2/2]

virtual void ROOT::RFieldBase::GenerateColumns ( const ROOT::RNTupleDescriptor & )

inlineprotectedvirtual

Implementations in derived classes should create the backing columns corresponsing to the field type for reading.

The default implementation does not attach any columns to the field. The method should check, using the page source and fOnDiskId, if the column types match and throw if they don't.

Reimplemented in ROOT::RArrayAsRVecField, ROOT::Experimental::Internal::RArraySizeField, ROOT::RStreamerField, ROOT::RCardinalityField, ROOT::RNullableField, ROOT::Experimental::Internal::RRDFCardinalityField, ROOT::RRealField< T >, ROOT::RRealField< double >, ROOT::RRealField< float >, ROOT::RProxiedCollectionField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RBitsetField, ROOT::RVariantField, ROOT::RSimpleField< T >, ROOT::RSimpleField< bool >, ROOT::RSimpleField< char >, ROOT::RSimpleField< double >, and ROOT::RSimpleField< float >.

Definition at line 375 of file RFieldBase.hxx.

◆ GenerateColumnsImpl() [1/3]

template<typename... ColumnCppTs>

void ROOT::RFieldBase::GenerateColumnsImpl ( )

inlineprotected

For writing, use the currently set column representative.

Definition at line 331 of file RFieldBase.hxx.

◆ GenerateColumnsImpl() [2/3]

template<std::uint32_t ColumnIndexT, typename HeadT , typename... TailTs>

void ROOT::RFieldBase::GenerateColumnsImpl	(	const ColumnRepresentation_t &	representation,
		std::uint16_t	representationIndex )

inlineprotected

Helpers for generating columns.

We use the fact that most fields have the same C++/memory types for all their column representations. Where possible, we call the helpers not from the header to reduce compilation time.

Definition at line 309 of file RFieldBase.hxx.

◆ GenerateColumnsImpl() [3/3]

template<typename... ColumnCppTs>

void ROOT::RFieldBase::GenerateColumnsImpl ( const ROOT::RNTupleDescriptor & desc )

inlineprotected

For reading, use the on-disk column list.

Definition at line 347 of file RFieldBase.hxx.

◆ GetAlignment()

virtual size_t ROOT::RFieldBase::GetAlignment ( ) const

pure virtual

As a rule of thumb, the alignment is equal to the size of the type.

There are, however, various exceptions to this rule depending on OS and CPU architecture. So enforce the alignment to be explicitly spelled out.

Implemented in ROOT::Experimental::Internal::RRDFCardinalityField, ROOT::Experimental::Internal::RArraySizeField, ROOT::RFieldZero, ROOT::RInvalidField, ROOT::RClassField, ROOT::RStreamerField, ROOT::REnumField, ROOT::RSimpleField< T >, ROOT::RSimpleField< bool >, ROOT::RSimpleField< char >, ROOT::RSimpleField< double >, ROOT::RSimpleField< float >, ROOT::RField< RNTupleCardinality< SizeT > >, ROOT::RField< TObject >, ROOT::RProxiedCollectionField, ROOT::RRecordField, ROOT::RArrayField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RArrayAsRVecField, ROOT::RAtomicField, ROOT::RBitsetField, ROOT::ROptionalField, ROOT::RUniquePtrField, and ROOT::RVariantField.

◆ GetColumnRepresentations()

const ROOT::RFieldBase::RColumnRepresentations & ROOT::RFieldBase::GetColumnRepresentations ( ) const

protectedvirtual

Implementations in derived classes should return a static RColumnRepresentations object.

The default implementation does not attach any columns to the field.

Reimplemented in ROOT::Experimental::Internal::RRDFCardinalityField, ROOT::RStreamerField, ROOT::RCardinalityField, ROOT::RField< bool >, ROOT::RField< char >, ROOT::RField< float >, ROOT::RField< double >, ROOT::RProxiedCollectionField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RBitsetField, ROOT::RNullableField, and ROOT::RVariantField.

Definition at line 621 of file RFieldBase.cxx.

◆ GetColumnRepresentatives()

ROOT::RFieldBase::RColumnRepresentations::Selection_t ROOT::RFieldBase::GetColumnRepresentatives ( ) const

Returns the fColumnRepresentative pointee or, if unset (always the case for artificial fields), the field's default representative.

Definition at line 841 of file RFieldBase.cxx.

◆ GetConstSubfields()

std::vector< const ROOT::RFieldBase * > ROOT::RFieldBase::GetConstSubfields ( ) const

Definition at line 727 of file RFieldBase.cxx.

◆ GetDeleter()

virtual std::unique_ptr< RDeleter > ROOT::RFieldBase::GetDeleter ( ) const

inlineprotectedvirtual

Reimplemented in ROOT::RClassField, ROOT::RStreamerField, ROOT::RField< TObject >, ROOT::RProxiedCollectionField, ROOT::RRecordField, ROOT::RArrayField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RArrayAsRVecField, ROOT::RAtomicField, ROOT::ROptionalField, ROOT::RUniquePtrField, and ROOT::RVariantField.

Definition at line 394 of file RFieldBase.hxx.

◆ GetDeleterOf()

static std::unique_ptr< RDeleter > ROOT::RFieldBase::GetDeleterOf ( const RFieldBase & other )

inlinestaticprotected

Definition at line 397 of file RFieldBase.hxx.

◆ GetDescription()

const std::string & ROOT::RFieldBase::GetDescription ( ) const

inline

Get the field's description.

Definition at line 583 of file RFieldBase.hxx.

◆ GetExtraTypeInfo()

virtual ROOT::RExtraTypeInfoDescriptor ROOT::RFieldBase::GetExtraTypeInfo ( ) const

inlineprotectedvirtual

Reimplemented in ROOT::RStreamerField.

Definition at line 479 of file RFieldBase.hxx.

◆ GetFieldName()

const std::string & ROOT::RFieldBase::GetFieldName ( ) const

inline

Definition at line 570 of file RFieldBase.hxx.

◆ GetFieldVersion()

virtual std::uint32_t ROOT::RFieldBase::GetFieldVersion ( ) const

inlinevirtual

Indicates an evolution of the mapping scheme from C++ type to columns.

Definition at line 601 of file RFieldBase.hxx.

◆ GetMutableSubfields()

std::vector< ROOT::RFieldBase * > ROOT::RFieldBase::GetMutableSubfields ( )

Definition at line 717 of file RFieldBase.cxx.

◆ GetNRepetitions()

std::size_t ROOT::RFieldBase::GetNRepetitions ( ) const

inline

Definition at line 576 of file RFieldBase.hxx.

◆ GetOnDiskId()

ROOT::DescriptorId_t ROOT::RFieldBase::GetOnDiskId ( ) const

inline

Definition at line 587 of file RFieldBase.hxx.

◆ GetOnDiskTypeChecksum()

std::uint32_t ROOT::RFieldBase::GetOnDiskTypeChecksum ( ) const

inline

Return checksum stored in the field descriptor; only valid after a call to ConnectPageSource(), if the field stored a type checksum.

Definition at line 610 of file RFieldBase.hxx.

◆ GetOnDiskTypeVersion()

std::uint32_t ROOT::RFieldBase::GetOnDiskTypeVersion ( ) const

inline

Return the C++ type version stored in the field descriptor; only valid after a call to ConnectPageSource()

Definition at line 607 of file RFieldBase.hxx.

◆ GetParent()

const RFieldBase * ROOT::RFieldBase::GetParent ( ) const

inline

Definition at line 577 of file RFieldBase.hxx.

◆ GetPrincipalColumnOf()

static ROOT::Internal::RColumn * ROOT::RFieldBase::GetPrincipalColumnOf ( const RFieldBase & other )

inlinestaticprotected

Fields may need direct access to the principal column of their sub fields, e.g. in RRVecField::ReadBulk.

Definition at line 462 of file RFieldBase.hxx.

◆ GetQualifiedFieldName()

std::string ROOT::RFieldBase::GetQualifiedFieldName ( ) const

Returns the field name and parent field names separated by dots ("grandparent.parent.child")

Definition at line 252 of file RFieldBase.cxx.

◆ GetState()

EState ROOT::RFieldBase::GetState ( ) const

inline

Definition at line 585 of file RFieldBase.hxx.

◆ GetStructure()

ROOT::ENTupleStructure ROOT::RFieldBase::GetStructure ( ) const

inline

Definition at line 575 of file RFieldBase.hxx.

◆ GetTraits()

std::uint32_t ROOT::RFieldBase::GetTraits ( ) const

inline

Definition at line 567 of file RFieldBase.hxx.

◆ GetTypeAlias()

const std::string & ROOT::RFieldBase::GetTypeAlias ( ) const

inline

Definition at line 574 of file RFieldBase.hxx.

◆ GetTypeChecksum()

virtual std::uint32_t ROOT::RFieldBase::GetTypeChecksum ( ) const

inlinevirtual

Return the current TClass reported checksum of this class. Only valid if kTraitTypeChecksum is set.

Reimplemented in ROOT::RClassField, ROOT::RStreamerField, and ROOT::RField< TObject >.

Definition at line 605 of file RFieldBase.hxx.

◆ GetTypeName()

const std::string & ROOT::RFieldBase::GetTypeName ( ) const

inline

Definition at line 573 of file RFieldBase.hxx.

◆ GetTypeVersion()

virtual std::uint32_t ROOT::RFieldBase::GetTypeVersion ( ) const

inlinevirtual

Indicates an evolution of the C++ type itself.

Reimplemented in ROOT::RClassField, ROOT::RStreamerField, and ROOT::RField< TObject >.

Definition at line 603 of file RFieldBase.hxx.

◆ GetValueSize()

virtual size_t ROOT::RFieldBase::GetValueSize ( ) const

pure virtual

◆ HasDefaultColumnRepresentative()

bool ROOT::RFieldBase::HasDefaultColumnRepresentative ( ) const

inline

Whether or not an explicit column representative was set.

Definition at line 598 of file RFieldBase.hxx.

◆ HasExtraTypeInfo()

virtual bool ROOT::RFieldBase::HasExtraTypeInfo ( ) const

inlineprotectedvirtual

Reimplemented in ROOT::RStreamerField.

Definition at line 475 of file RFieldBase.hxx.

◆ HasReadCallbacks()

bool ROOT::RFieldBase::HasReadCallbacks ( ) const

inline

Definition at line 568 of file RFieldBase.hxx.

◆ InvokeReadCallbacks()

void ROOT::RFieldBase::InvokeReadCallbacks ( void * target )

inlineprivate

Definition at line 226 of file RFieldBase.hxx.

◆ IsArtificial()

bool ROOT::RFieldBase::IsArtificial ( ) const

inline

Definition at line 581 of file RFieldBase.hxx.

◆ IsSimple()

bool ROOT::RFieldBase::IsSimple ( ) const

inline

Definition at line 580 of file RFieldBase.hxx.

◆ operator=() [1/2]

RFieldBase & ROOT::RFieldBase::operator= ( const RFieldBase & )

delete

◆ operator=() [2/2]

RFieldBase & ROOT::RFieldBase::operator= ( RFieldBase && )

default

◆ Read() [1/2]

void ROOT::RFieldBase::Read	(	RNTupleLocalIndex	localIndex,
		void *	to )

inlineprotected

Populate a single value with data from the field.

The memory location pointed to by to needs to be of the fitting type. The fast path is conditioned by the field qualifying as simple, i.e. maps as-is to a single column and has no read callback.

Definition at line 430 of file RFieldBase.hxx.

◆ Read() [2/2]

void ROOT::RFieldBase::Read	(	ROOT::NTupleSize_t	globalIndex,
		void *	to )

inlineprotected

Populate a single value with data from the field.

The memory location pointed to by to needs to be of the fitting type. The fast path is conditioned by the field qualifying as simple, i.e. maps as-is to a single column and has no read callback.

Definition at line 412 of file RFieldBase.hxx.

◆ ReadBulk()

std::size_t ROOT::RFieldBase::ReadBulk ( const RBulkSpec & bulkSpec )

protected

Returns the number of newly available values, that is the number of bools in bulkSpec.fMaskAvail that flipped from false to true.

As a special return value, kAllSet can be used if all values are read independent from the masks.

Definition at line 799 of file RFieldBase.cxx.

◆ ReadBulkImpl()

std::size_t ROOT::RFieldBase::ReadBulkImpl ( const RBulkSpec & bulkSpec )

protectedvirtual

General implementation of bulk read.

Loop over the required range and read values that are required and not already present. Derived classes may implement more optimized versions of this method. See ReadBulk() for the return value.

Reimplemented in ROOT::RField< RNTupleCardinality< SizeT > >, and ROOT::RRVecField.

Definition at line 654 of file RFieldBase.cxx.

◆ ReadGlobalImpl()

void ROOT::RFieldBase::ReadGlobalImpl	(	ROOT::NTupleSize_t	globalIndex,
		void *	to )

protectedvirtual

◆ ReadInClusterImpl()

void ROOT::RFieldBase::ReadInClusterImpl	(	RNTupleLocalIndex	localIndex,
		void *	to )

protectedvirtual

Reimplemented in ROOT::RClassField, ROOT::REnumField, ROOT::RField< RNTupleCardinality< SizeT > >, ROOT::RRecordField, ROOT::RArrayField, ROOT::RArrayAsRVecField, ROOT::RAtomicField, ROOT::RBitsetField, ROOT::Experimental::Internal::RArraySizeField, and ROOT::Experimental::Internal::RRDFCardinalityField.

Definition at line 649 of file RFieldBase.cxx.

◆ RemoveReadCallback()

void ROOT::RFieldBase::RemoveReadCallback ( size_t idx )

protected

Definition at line 918 of file RFieldBase.cxx.

◆ SetArtificial()

void ROOT::RFieldBase::SetArtificial ( )

inlineprivate

Definition at line 256 of file RFieldBase.hxx.

◆ SetColumnRepresentatives()

void ROOT::RFieldBase::SetColumnRepresentatives ( const RColumnRepresentations::Selection_t & representatives )

Fixes a column representative.

This can only be done before connecting the field to a page sink. Otherwise, or if the provided representation is not in the list of GetColumnRepresentations, an exception is thrown

Definition at line 855 of file RFieldBase.cxx.

◆ SetDescription()

void ROOT::RFieldBase::SetDescription ( std::string_view description )

Definition at line 764 of file RFieldBase.cxx.

◆ SetOnDiskId()

void ROOT::RFieldBase::SetOnDiskId ( ROOT::DescriptorId_t id )

Definition at line 771 of file RFieldBase.cxx.

◆ SplitValue()

std::vector< ROOT::RFieldBase::RValue > ROOT::RFieldBase::SplitValue ( const RValue & value ) const

virtual

Creates the list of direct child values given a value for this field.

E.g. a single value for the correct variant or all the elements of a collection. The default implementation assumes no sub values and returns an empty vector.

Reimplemented in ROOT::RArrayAsRVecField, ROOT::RClassField, ROOT::REnumField, ROOT::RField< TObject >, ROOT::RProxiedCollectionField, ROOT::RRecordField, ROOT::RArrayField, ROOT::RRVecField, ROOT::RVectorField, ROOT::RAtomicField, ROOT::ROptionalField, and ROOT::RUniquePtrField.

Definition at line 688 of file RFieldBase.cxx.

Friends And Related Symbol Documentation

◆ Internal::CallCommitClusterOnField

void Internal::CallCommitClusterOnField ( RFieldBase & )

friend

◆ Internal::CallConnectPageSinkOnField

void Internal::CallConnectPageSinkOnField	(	RFieldBase &	,
		ROOT::Experimental::Internal::RPageSink &	,
		ROOT::NTupleSize_t	)

friend

◆ Internal::CallConnectPageSourceOnField

void Internal::CallConnectPageSourceOnField	(	RFieldBase &	,
		ROOT::Experimental::Internal::RPageSource &	)

friend

◆ Internal::CallFieldBaseCreate

ROOT::RResult< std::unique_ptr< ROOT::RFieldBase > > Internal::CallFieldBaseCreate	(	const std::string &	fieldName,
		const std::string &	typeName,
		const ROOT::RCreateFieldOptions &	options,
		const ROOT::RNTupleDescriptor *	desc,
		ROOT::DescriptorId_t	fieldId )

friend

◆ Internal::CallFlushColumnsOnField

void Internal::CallFlushColumnsOnField ( RFieldBase & )

friend

◆ ROOT::Experimental::RNTupleJoinProcessor

friend class ROOT::Experimental::RNTupleJoinProcessor

friend

Definition at line 85 of file RFieldBase.hxx.

◆ ROOT::Internal::RFieldCallbackInjector

friend struct ROOT::Internal::RFieldCallbackInjector

friend

Definition at line 86 of file RFieldBase.hxx.

◆ ROOT::Internal::RFieldRepresentationModifier

friend struct ROOT::Internal::RFieldRepresentationModifier

friend

Definition at line 87 of file RFieldBase.hxx.

◆ ROOT::RClassField

friend class ROOT::RClassField

friend

Definition at line 84 of file RFieldBase.hxx.

Member Data Documentation

◆ fAuxiliaryColumn

ROOT::Internal::RColumn* ROOT::RFieldBase::fAuxiliaryColumn = nullptr

protected

Some fields have a second column in its column representation.

In this case, fAuxiliaryColumn points into fAvailableColumns to the column that immediately follows the column fPrincipalColumn points to.

Definition at line 282 of file RFieldBase.hxx.

◆ fAvailableColumns

std::vector<std::unique_ptr<ROOT::Internal::RColumn> > ROOT::RFieldBase::fAvailableColumns

protected

The columns are connected either to a sink or to a source (not to both); they are owned by the field.

Contains all columns of all representations in order of representation and column index.

Definition at line 285 of file RFieldBase.hxx.

◆ fColumnRepresentatives

std::vector<std::reference_wrapper<const ColumnRepresentation_t> > ROOT::RFieldBase::fColumnRepresentatives

protected

Pointers into the static vector GetColumnRepresentations().GetSerializationTypes() when SetColumnRepresentatives is called.

Otherwise (if empty) GetColumnRepresentatives() returns a vector with a single element, the default representation. Always empty for artificial fields.

Definition at line 300 of file RFieldBase.hxx.

◆ fDescription

std::string ROOT::RFieldBase::fDescription

private

Free text set by the user.

Definition at line 222 of file RFieldBase.hxx.

◆ fIsArtificial

bool ROOT::RFieldBase::fIsArtificial = false

private

A field that is not backed on disk but computed, e.g.

a default-constructed missing field or a field whose data is created by I/O customization rules. Subfields of artificial fields are artificial, too.

Definition at line 216 of file RFieldBase.hxx.

◆ fIsSimple

bool ROOT::RFieldBase::fIsSimple

private

A field qualifies as simple if it is mappable (which implies it has a single principal column), and it is not an artificial field and has no post-read callback.

Definition at line 212 of file RFieldBase.hxx.

◆ fName

std::string ROOT::RFieldBase::fName

private

The field name relative to its parent field.

Definition at line 203 of file RFieldBase.hxx.

◆ fNRepetitions

std::size_t ROOT::RFieldBase::fNRepetitions

private

For fixed sized arrays, the array length.

Definition at line 209 of file RFieldBase.hxx.

◆ fOnDiskId

ROOT::DescriptorId_t ROOT::RFieldBase::fOnDiskId = ROOT::kInvalidDescriptorId

private

When the columns are connected to a page source or page sink, the field represents a field id in the corresponding RNTuple descriptor.

This on-disk ID is set in RPageSink::Create() for writing and by RFieldDescriptor::CreateField() when recreating a field / model from the stored descriptor.

Definition at line 220 of file RFieldBase.hxx.

◆ fOnDiskTypeChecksum

std::uint32_t ROOT::RFieldBase::fOnDiskTypeChecksum = 0

protected

TClass checksum cached from the descriptor after a call to ConnectPageSource().

Only set for classes with dictionaries.

Definition at line 296 of file RFieldBase.hxx.

◆ fOnDiskTypeVersion

std::uint32_t ROOT::RFieldBase::fOnDiskTypeVersion = kInvalidTypeVersion

protected

C++ type version cached from the descriptor after a call to ConnectPageSource()

Definition at line 293 of file RFieldBase.hxx.

◆ fParent

RFieldBase* ROOT::RFieldBase::fParent

protected

Sub fields point to their mother field.

Definition at line 272 of file RFieldBase.hxx.

◆ fPrincipalColumn

ROOT::Internal::RColumn* ROOT::RFieldBase::fPrincipalColumn = nullptr

protected

All fields that have columns have a distinct main column.

E.g., for simple fields (float, int, ...), the principal column corresponds to the field type. For collection fields except fixed-sized arrays, the main column is the offset field. Class fields have no column of their own. When reading, points to any column of the column team of the active representation. Usually, this is just the first column. When writing, points to the first column index of the currently active (not suppressed) column representation.

Definition at line 279 of file RFieldBase.hxx.

◆ fReadCallbacks

std::vector<ReadCallback_t> ROOT::RFieldBase::fReadCallbacks

protected

List of functions to be called after reading a value.

Definition at line 291 of file RFieldBase.hxx.

◆ fState

EState ROOT::RFieldBase::fState = EState::kUnconnected

private

Changed by ConnectTo[Sink,Source], reset by Clone()

Definition at line 224 of file RFieldBase.hxx.

◆ fStructure

ROOT::ENTupleStructure ROOT::RFieldBase::fStructure

private

The role of this field in the data model structure.

Definition at line 207 of file RFieldBase.hxx.

◆ fSubfields

std::vector<std::unique_ptr<RFieldBase> > ROOT::RFieldBase::fSubfields

protected

Collections and classes own sub fields.

Definition at line 270 of file RFieldBase.hxx.

◆ fTraits

std::uint32_t ROOT::RFieldBase::fTraits = 0

protected

Properties of the type that allow for optimizations of collections of that type.

Definition at line 287 of file RFieldBase.hxx.

◆ fType

std::string ROOT::RFieldBase::fType

private

The C++ type captured by this field.

Definition at line 205 of file RFieldBase.hxx.

◆ fTypeAlias

std::string ROOT::RFieldBase::fTypeAlias

protected

A typedef or using name that was used when creating the field.

Definition at line 289 of file RFieldBase.hxx.

◆ kInvalidTypeVersion

constexpr std::uint32_t ROOT::RFieldBase::kInvalidTypeVersion = -1U

staticconstexpr

Definition at line 135 of file RFieldBase.hxx.

Libraries for ROOT::RFieldBase:

[legend]

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

tree/ntuple/v7/inc/ROOT/RFieldBase.hxx
tree/ntuple/v7/inc/ROOT/RField.hxx
tree/ntuple/v7/src/RFieldBase.cxx

Classes

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Private Types

Private Member Functions

Private Attributes

Friends

Member Typedef Documentation

◆ ColumnRepresentation_t

◆ RConstSchemaIterator

◆ ReadCallback_t

◆ RSchemaIterator

Member Enumeration Documentation

◆ anonymous enum

◆ EState

| |

Constructor & Destructor Documentation

◆ RFieldBase() [1/3]

◆ RFieldBase() [2/3]

◆ RFieldBase() [3/3]

◆ ~RFieldBase()

Member Function Documentation

◆ AcceptVisitor()

◆ AddReadCallback()

◆ AfterConnectPageSource()

◆ Append()

◆ AppendImpl()

◆ Attach()

◆ AutoAdjustColumnTypes()

◆ BeforeConnectPageSource()

◆ begin() [1/2]

◆ begin() [2/2]

◆ BindValue()

◆ CallAppendOn()

◆ CallConstructValueOn()

◆ CallCreateObjectRawPtrOn()

◆ CallReadOn() [1/2]

◆ CallReadOn() [2/2]

◆ cbegin()

◆ cend()

◆ Check()

◆ Clone()

◆ CloneImpl()

◆ CommitCluster()

◆ CommitClusterImpl()

◆ ConnectPageSink()

◆ ConnectPageSource()

◆ ConstructValue()

◆ Create() [1/2]

◆ Create() [2/2]

◆ CreateBulk()

◆ CreateObject() [1/3]

◆ CreateObject() [2/3]

◆ CreateObject() [3/3]

◆ CreateObjectRawPtr()

◆ CreateValue()

◆ end() [1/2]

◆ end() [2/2]

◆ EnsureCompatibleColumnTypes()

◆ EntryToColumnElementIndex()

◆ FlushColumns()

◆ GenerateColumns() [1/2]

◆ GenerateColumns() [2/2]

◆ GenerateColumnsImpl() [1/3]

◆ GenerateColumnsImpl() [2/3]

◆ GenerateColumnsImpl() [3/3]

◆ GetAlignment()

◆ GetColumnRepresentations()

◆ GetColumnRepresentatives()

◆ GetConstSubfields()

◆ GetDeleter()

◆ GetDeleterOf()

◆ GetDescription()

◆ GetExtraTypeInfo()

◆ GetFieldName()