Definition at line 62 of file RFieldFundamental.hxx.

Public Types
enum
using	ColumnRepresentation_t
enum	EState
	During its lifetime, a field undergoes the following possible state transitions: More...
using	RConstSchemaIterator
using	RSchemaIterator

Public Member Functions
	RField (RField &&other)=default
	RField (std::string_view name)
	~RField () final=default
void	AcceptVisitor (ROOT::Detail::RFieldVisitor &visitor) const final
void	AcceptVisitor (ROOT::Detail::RFieldVisitor &visitor) const final
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 subfields using a possibly new name and a new, unconnected set of columns.
RBulkValues	CreateBulk ()
	Creates a new, initially empty bulk.
std::unique_ptr< void, typename RFieldBase::RCreateObjectDeleter< void >::deleter >	CreateObject () const
std::unique_ptr< bool, typename RCreateObjectDeleter< bool >::deleter >	CreateObject () const
	Generates an object of the field type and allocates new initialized memory according to the type.
std::unique_ptr< void, typename ROOT::RFieldBase::RCreateObjectDeleter< void >::deleter >	CreateObject () const
RValue	CreateValue ()
	Generates an object of the field's type, wraps it in a shared pointer and returns it as an RValue connected to the field.
RSchemaIterator	end ()
RConstSchemaIterator	end () const
size_t	GetAlignment () const final
	As a rule of thumb, the alignment is equal to the size of the type.
const TClass *	GetClass () const
	Return the TClass instance backing this field.
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
const std::type_info *	GetPolymorphicTypeInfo () const
	For polymorphic classes (that declare or inherit at least one virtual method), return the expected dynamic type of any user object.
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
std::uint32_t	GetTypeChecksum () const final
	Return the current TClass reported checksum of this class. Only valid if kTraitTypeChecksum is set.
const std::string &	GetTypeName () const
std::uint32_t	GetTypeVersion () const final
	Indicates an evolution of the C++ type itself.
size_t	GetValueSize () const final
	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
bool *	Map (ROOT::NTupleSize_t globalIndex)
bool *	MapV (ROOT::NTupleSize_t globalIndex, ROOT::NTupleSize_t &nItems)
RField &	operator= (RField &&other)=default
void	SetColumnRepresentatives (const RColumnRepresentations::Selection_t &representatives)
	Fixes a column representative.
void	SetDescription (std::string_view description)
void	SetOnDiskId (ROOT::DescriptorId_t id)
std::vector< RValue >	SplitValue (const RValue &value) const final
	Creates the list of direct child values given an existing 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 std::string	TypeName ()

Static Public Attributes
static constexpr std::uint32_t	kInvalidTypeVersion

Protected Types
enum
	Bits used in CompareOnDisk(). More...

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.
std::size_t	Append (const void *from)
	Write the given value into columns.
std::size_t	AppendImpl (const void *from) final
	Operations on values of complex types, e.g.
void	Attach (std::unique_ptr< RFieldBase > child, std::string_view expectedChildName="")
	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.
std::unique_ptr< RFieldBase >	BeforeConnectPageSource (ROOT::Internal::RPageSource &pageSource) final
	Called by ConnectPageSource() before connecting; derived classes may override this as appropriate, e.g.
std::unique_ptr< RFieldBase >	CloneImpl (std::string_view newName) const final
	Called by Clone(), which additionally copies the on-disk ID.
std::unique_ptr< RFieldBase >	CloneImpl (std::string_view newName) const final
	Called by Clone(), which additionally copies the on-disk ID.
virtual void	CommitClusterImpl ()
std::uint32_t	CompareOnDiskField (const RFieldDescriptor &fieldDesc, std::uint32_t ignoreBits) const
	Returns a combination of kDiff... flags, indicating peroperties that are different between the field at hand and the given on-disk field.
void	ConstructValue (void *where) const final
	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.
RResult< void >	EnsureMatchingOnDiskCollection (const RNTupleDescriptor &desc) const
	Convenience wrapper for the common case of calling EnsureMatchinOnDiskField() for collections.
RResult< void >	EnsureMatchingOnDiskField (const RNTupleDescriptor &desc, std::uint32_t ignoreBits=0) const
	Compares the field to the corresponding on-disk field information in the provided descriptor.
RResult< void >	EnsureMatchingTypePrefix (const RNTupleDescriptor &desc, const std::vector< std::string > &prefixes) const
	Many fields accept a range of type prefixes for schema evolution, e.g.
virtual void	GenerateColumns ()
	Implementations in derived classes should create the backing columns corresponding to the field type for writing.
virtual void	GenerateColumns (const ROOT::RNTupleDescriptor &)
	Implementations in derived classes should create the backing columns corresponding to the field type for reading.
void	GenerateColumnsImpl ()
	For writing, use the currently set column representative.
void	GenerateColumnsImpl (const ColumnRepresentation_t &representation, std::uint16_t representationIndex)
	Helpers for generating columns.
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.
const RColumnRepresentations &	GetColumnRepresentations () const final
	Implementations in derived classes should return a static RColumnRepresentations object.
std::unique_ptr< RDeleter >	GetDeleter () const final
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.
void	ReadGlobalImpl (ROOT::NTupleSize_t globalIndex, void *to) final
void	ReadInClusterImpl (RNTupleLocalIndex localIndex, void *to) final
void	ReconcileOnDiskField (const RNTupleDescriptor &desc) final
	For non-artificial fields, check compatibility of the in-memory field and the on-disk field.
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 void	CallSetArtificialOn (RFieldBase &other)
	Allow parents to mark their childs as artificial fields (used in class and record fields).
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 subfields, e.g. in RRVecField::ReadBulk().

Protected Attributes
ROOT::Internal::RColumn *	fAuxiliaryColumn
	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 returned by RColumnRepresentations::GetSerializationTypes() when SetColumnRepresentatives() is called.
std::uint32_t	fOnDiskTypeChecksum
	TClass checksum cached from the descriptor after a call to ConnectPageSource().
std::uint32_t	fOnDiskTypeVersion
	C++ type version cached from the descriptor after a call to ConnectPageSource().
RFieldBase *	fParent
	Subfields point to their mother field.
ROOT::Internal::RColumn *	fPrincipalColumn
	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 subfields.
std::uint32_t	fTraits
	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
enum	ESubfieldRole
using	ReadCallback_t

Private Member Functions
void	AddReadCallbacksFromIORule (const TSchemaRule *rule)
	Register post-read callback corresponding to a ROOT I/O customization rules.
void	Attach (std::unique_ptr< RFieldBase > child, RSubfieldInfo info)
void	CommitCluster ()
	Flushes data from active columns to disk and calls CommitClusterImpl().
void	ConnectPageSink (ROOT::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::Internal::RPageSource &pageSource)
	Connects the field and its subfield 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 vice versa.
std::vector< const TSchemaRule * >	FindRules (const ROOT::RFieldDescriptor *fieldDesc)
	Given the on-disk information from the page source, find all the I/O customization rules that apply to the class field at hand, to which the fieldDesc descriptor, if provided, must correspond.
void	FlushColumns ()
	Flushes data from active columns.
void	InvokeReadCallbacks (void *target)
ROOT::DescriptorId_t	LookupMember (const ROOT::RNTupleDescriptor &desc, std::string_view memberName, ROOT::DescriptorId_t classFieldId)
	Returns the id of member 'name' in the class field given by 'fieldId', or kInvalidDescriptorId if no such member exist.
void	PrepareStagingArea (const std::vector< const TSchemaRule * > &rules, const ROOT::RNTupleDescriptor &desc, const ROOT::RFieldDescriptor &classFieldId)
	If there are rules with inputs (source members), create the staging area according to the TClass instance that corresponds to the on-disk field.
void	ReconcileFloatingPointField (const RNTupleDescriptor &desc)
void	ReconcileIntegralField (const RNTupleDescriptor &desc)
void	SetArtificial ()
void	SetStagingClass (const std::string &className, unsigned int classVersion)
	Sets fStagingClass according to the given name and version.

Private Attributes
TClass *	fClass
std::string	fDescription
	Free text set by the user.
bool	fIsArtificial
	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::size_t	fMaxAlignment
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
	When the columns are connected to a page source or page sink, the field represents a field id in the corresponding RNTuple descriptor.
std::unique_ptr< unsigned char[]>	fStagingArea
	The staging area stores inputs to I/O rules according to the offsets given by the streamer info of "TypeName@@Version".
TClass *	fStagingClass
	The TClass instance that corresponds to the staging area.
std::unordered_map< std::string, RStagingItem >	fStagingItems
	Lookup staging items by member name.
EState	fState
	Changed by ConnectTo[Sink,Source], reset by Clone().
ROOT::ENTupleStructure	fStructure
	The role of this field in the data model structure.
std::vector< RSubfieldInfo >	fSubfieldsInfo
	Additional information kept for each entry in fSubfields.
std::string	fType
	The C++ type captured by this field.

Static Private Attributes
static constexpr const char *	kPrefixInherited
	Prefix used in the subfield names generated for base classes.

#include <ROOT/RField/RFieldFundamental.hxx>

Inheritance diagram for ROOT::RField< bool >:

Member Typedef Documentation

◆ ColumnRepresentation_t

using ROOT::RFieldBase::ColumnRepresentation_t

Definition at line 165 of file RFieldBase.hxx.

◆ RConstSchemaIterator

using ROOT::RFieldBase::RConstSchemaIterator

Definition at line 561 of file RFieldBase.hxx.

◆ ReadCallback_t

using ROOT::RFieldBase::ReadCallback_t

private

Definition at line 102 of file RFieldBase.hxx.

◆ RSchemaIterator

using ROOT::RFieldBase::RSchemaIterator

Definition at line 560 of file RFieldBase.hxx.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Definition at line 140 of file RFieldBase.hxx.

◆ anonymous enum

anonymous enum

protected

Bits used in CompareOnDisk().

Definition at line 286 of file RFieldBase.hxx.

◆ EState

enum ROOT::RFieldBase::EState

strong

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

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

| |

Definition at line 174 of file RFieldBase.hxx.

◆ ESubfieldRole

enum ROOT::RClassField::ESubfieldRole

private

Definition at line 137 of file RField.hxx.

Constructor & Destructor Documentation

◆ RField() [1/2]

ROOT::RField< bool >::RField ( std::string_view name )

inlineexplicit

Definition at line 73 of file RFieldFundamental.hxx.

◆ RField() [2/2]

ROOT::RField< bool >::RField ( RField< bool > && other )

default

◆ ~RField()

ROOT::RField< bool >::~RField ( )

finaldefault

Member Function Documentation

◆ AcceptVisitor() [1/2]

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

final

Definition at line 231 of file RFieldMeta.cxx.

◆ AcceptVisitor() [2/2]

void ROOT::RField< bool >::AcceptVisitor ( ROOT::Detail::RFieldVisitor & visitor ) const

finalvirtual

Reimplemented from ROOT::RClassField.

Definition at line 293 of file RField.cxx.

◆ 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 500 of file RFieldBase.cxx.

◆ AddReadCallbacksFromIORule()

void ROOT::RClassField::AddReadCallbacksFromIORule ( const TSchemaRule * rule )

private

Register post-read callback corresponding to a ROOT I/O customization rules.

Definition at line 195 of file RFieldMeta.cxx.

◆ 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 440 of file RFieldBase.cxx.

◆ AppendImpl()

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

finalprotected

Operations on values of complex types, e.g.

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

Definition at line 208 of file RFieldMeta.cxx.

◆ Attach() [1/2]

void ROOT::RClassField::Attach	(	std::unique_ptr< RFieldBase >	child,
		RSubfieldInfo	info )

private

Definition at line 182 of file RFieldMeta.cxx.

◆ Attach() [2/2]

void ROOT::RFieldBase::Attach	(	std::unique_ptr< RFieldBase >	child,
		std::string_view	expectedChildName = "" )

protected

Add a new subfield to the list of nested fields.

Throws an exception if childName is non-empty and the passed field has a different name.

Definition at line 516 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 417 of file RFieldBase.cxx.

◆ BeforeConnectPageSource()

std::unique_ptr< ROOT::RFieldBase > ROOT::RClassField::BeforeConnectPageSource ( ROOT::Internal::RPageSource & pageSource )

finalprotected

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

for the application of I/O rules. In the process, the field at hand or its subfields may be marked as "artifical", i.e. introduced by schema evolution and not backed by on-disk information. May return a field substitute that fits the on-disk schema as a replacement for the field at hand. A field substitute must read into the same in-memory layout than the original field and field substitutions must not be cyclic.

Definition at line 212 of file RFieldMeta.cxx.

◆ begin() [1/2]

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

Definition at line 676 of file RFieldBase.cxx.

◆ begin() [2/2]

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

Definition at line 678 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 621 of file RFieldBase.cxx.

◆ CallAppendOn()

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 489 of file RFieldBase.hxx.

◆ CallConstructValueOn()

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 426 of file RFieldBase.hxx.

◆ CallCreateObjectRawPtrOn()

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

inlinestaticprotected

Definition at line 492 of file RFieldBase.hxx.

◆ CallReadOn() [1/2]

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

inlinestaticprotected

Definition at line 490 of file RFieldBase.hxx.

◆ CallReadOn() [2/2]

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

inlinestaticprotected

Definition at line 491 of file RFieldBase.hxx.

◆ CallSetArtificialOn()

void ROOT::RFieldBase::CallSetArtificialOn ( RFieldBase & other )

inlinestaticprotected

Allow parents to mark their childs as artificial fields (used in class and record fields).

Definition at line 430 of file RFieldBase.hxx.

◆ cbegin()

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

Definition at line 680 of file RFieldBase.cxx.

◆ cend()

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

Definition at line 681 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 subfield (subtype).

Definition at line 598 of file RFieldBase.cxx.

◆ Clone()

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

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

Definition at line 588 of file RFieldBase.cxx.

◆ CloneImpl() [1/2]

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

finalprotected

Called by Clone(), which additionally copies the on-disk ID.

Definition at line 203 of file RFieldMeta.cxx.

◆ CloneImpl() [2/2]

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

inlinefinalprotectedvirtual

Called by Clone(), which additionally copies the on-disk ID.

Reimplemented from ROOT::RClassField.

Definition at line 64 of file RFieldFundamental.hxx.

◆ CommitCluster()

void ROOT::RFieldBase::CommitCluster ( )

private

Flushes data from active columns to disk and calls CommitClusterImpl().

Definition at line 262 of file RFieldBase.cxx.

◆ CommitClusterImpl()

virtual void ROOT::RFieldBase::CommitClusterImpl ( )

inlineprotectedvirtual

Definition at line 504 of file RFieldBase.hxx.

◆ CompareOnDiskField()

std::uint32_t ROOT::RFieldBase::CompareOnDiskField	(	const RFieldDescriptor &	fieldDesc,
		std::uint32_t	ignoreBits ) const

protected

Returns a combination of kDiff... flags, indicating peroperties that are different between the field at hand and the given on-disk field.

Definition at line 536 of file RFieldBase.cxx.

◆ ConnectPageSink()

void ROOT::RFieldBase::ConnectPageSink	(	ROOT::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 266 of file RFieldBase.cxx.

◆ ConnectPageSource()

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

private

Connects the field and its subfield 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 subfields, 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 subfield name.

Definition at line 271 of file RFieldBase.cxx.

◆ ConstructValue()

void ROOT::RClassField::ConstructValue ( void * where ) const

finalprotected

Constructs value in a given location of size at least GetValueSize(). Called by the base class' CreateValue().

Definition at line 205 of file RFieldMeta.cxx.

◆ 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 594 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 554 of file RFieldBase.cxx.

◆ CreateBulk()

ROOT::RFieldBase::RBulkValues ROOT::RFieldBase::CreateBulk ( )

Creates a new, initially empty bulk.

RBulkValues::ReadBulk() will construct the array of values. The memory of the value array is managed by the RBulkValues class.

Definition at line 619 of file RFieldBase.cxx.

◆ CreateObject() [1/3]

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

◆ CreateObject() [2/3]

std::unique_ptr< bool, typename RFieldBase::RCreateObjectDeleter< bool >::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 612 of file RField.hxx.

◆ CreateObject() [3/3]

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

Definition at line 215 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 333 of file RFieldBase.cxx.

◆ CreateValue()

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

Generates an object of the field's type, wraps it in a shared pointer and returns it as an RValue connected to the field.

Definition at line 615 of file RFieldBase.cxx.

◆ end() [1/2]

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

Definition at line 677 of file RFieldBase.cxx.

◆ end() [2/2]

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

Definition at line 679 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 413 of file RFieldBase.cxx.

◆ EnsureMatchingOnDiskCollection()

ROOT::RResult< void > ROOT::RFieldBase::EnsureMatchingOnDiskCollection ( const RNTupleDescriptor & desc ) const

protected

Convenience wrapper for the common case of calling EnsureMatchinOnDiskField() for collections.

Collections may differ in type name (most collections schema evolve into each other). An on-disk SoA collection may also have any type version whereas all other collections need to have type version 0.

Definition at line 544 of file RFieldBase.cxx.

◆ EnsureMatchingOnDiskField()

ROOT::RResult< void > ROOT::RFieldBase::EnsureMatchingOnDiskField	(	const RNTupleDescriptor &	desc,
		std::uint32_t	ignoreBits = 0 ) const

protected

Compares the field to the corresponding on-disk field information in the provided descriptor.

Throws an exception if the fields don't match. Optionally, a set of bits can be provided that should be ignored in the comparison.

Definition at line 540 of file RFieldBase.cxx.

◆ EnsureMatchingTypePrefix()

ROOT::RResult< void > ROOT::RFieldBase::EnsureMatchingTypePrefix	(	const RNTupleDescriptor &	desc,
		const std::vector< std::string > &	prefixes ) const

protected

Many fields accept a range of type prefixes for schema evolution, e.g.

std::unique_ptr< and std::optional< for nullable fields

Definition at line 548 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 vice versa.

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 children 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 innermost field.

Definition at line 257 of file RFieldBase.cxx.

◆ FindRules()

std::vector< const ROOT::TSchemaRule * > ROOT::RClassField::FindRules ( const ROOT::RFieldDescriptor * fieldDesc )

private

Given the on-disk information from the page source, find all the I/O customization rules that apply to the class field at hand, to which the fieldDesc descriptor, if provided, must correspond.

Fields may not have an on-disk representation (e.g., when inserted by schema evolution), in which case the passed field descriptor is nullptr.

Definition at line 200 of file RFieldMeta.cxx.

◆ FlushColumns()

void ROOT::RFieldBase::FlushColumns ( )

private

Flushes data from active columns.

Definition at line 260 of file RFieldBase.cxx.

◆ GenerateColumns() [1/2]

virtual void ROOT::RFieldBase::GenerateColumns ( )

inlineprotectedvirtual

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

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

Definition at line 401 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 corresponding 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.

Definition at line 405 of file RFieldBase.hxx.

◆ GenerateColumnsImpl() [1/3]

void ROOT::RFieldBase::GenerateColumnsImpl ( )

inlineprotected

For writing, use the currently set column representative.

Definition at line 361 of file RFieldBase.hxx.

◆ GenerateColumnsImpl() [2/3]

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 339 of file RFieldBase.hxx.

◆ GenerateColumnsImpl() [3/3]

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

inlineprotected

For reading, use the on-disk column list.

Definition at line 377 of file RFieldBase.hxx.

◆ GetAlignment()

size_t ROOT::RClassField::GetAlignment ( ) const

inlinefinal

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.

Definition at line 223 of file RField.hxx.

◆ GetClass()

const TClass * ROOT::RClassField::GetClass ( ) const

inline

Return the TClass instance backing this field.

Definition at line 230 of file RField.hxx.

◆ GetColumnRepresentations() [1/2]

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.

Definition at line 398 of file RFieldBase.cxx.

◆ GetColumnRepresentations() [2/2]

const ROOT::RFieldBase::RColumnRepresentations & ROOT::RField< bool >::GetColumnRepresentations ( ) const

finalprotectedvirtual

Implementations in derived classes should return a static RColumnRepresentations object.

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

Reimplemented from ROOT::RFieldBase.

Definition at line 273 of file RField.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 656 of file RFieldBase.cxx.

◆ GetConstSubfields()

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

Definition at line 643 of file RFieldBase.cxx.

◆ GetDeleter()

std::unique_ptr< RDeleter > ROOT::RClassField::GetDeleter ( ) const

inlinefinalprotected

Definition at line 206 of file RField.hxx.

◆ GetDeleterOf()

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

inlinestaticprotected

Definition at line 427 of file RFieldBase.hxx.

◆ GetDescription()

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

inline

Get the field's description.

Definition at line 647 of file RFieldBase.hxx.

◆ GetExtraTypeInfo()

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

inlineprotectedvirtual

Definition at line 512 of file RFieldBase.hxx.

◆ GetFieldName()

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

inline

Definition at line 634 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 665 of file RFieldBase.hxx.

◆ GetMutableSubfields()

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

Definition at line 642 of file RFieldBase.cxx.

◆ GetNRepetitions()

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

inline

Definition at line 640 of file RFieldBase.hxx.

◆ GetOnDiskId()

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

inline

Definition at line 651 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 674 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 671 of file RFieldBase.hxx.

◆ GetParent()

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

inline

Definition at line 641 of file RFieldBase.hxx.

◆ GetPolymorphicTypeInfo()

const std::type_info * ROOT::RClassField::GetPolymorphicTypeInfo ( ) const

For polymorphic classes (that declare or inherit at least one virtual method), return the expected dynamic type of any user object.

If the class is not polymorphic, return nullptr.

Definition at line 228 of file RFieldMeta.cxx.

◆ GetPrincipalColumnOf()

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

inlinestaticprotected

Fields may need direct access to the principal column of their subfields, e.g. in RRVecField::ReadBulk().

Definition at line 495 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 636 of file RFieldBase.cxx.

◆ GetState()

EState ROOT::RFieldBase::GetState ( ) const

inline

Definition at line 649 of file RFieldBase.hxx.

◆ GetStructure()

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

inline

Definition at line 639 of file RFieldBase.hxx.

◆ GetTraits()

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

inline

Definition at line 631 of file RFieldBase.hxx.

◆ GetTypeAlias()

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

inline

Definition at line 638 of file RFieldBase.hxx.

◆ GetTypeChecksum()

std::uint32_t ROOT::RClassField::GetTypeChecksum ( ) const

final

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

Definition at line 225 of file RFieldMeta.cxx.

◆ GetTypeName()

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

inline

Definition at line 637 of file RFieldBase.hxx.

◆ GetTypeVersion()

std::uint32_t ROOT::RClassField::GetTypeVersion ( ) const

final

Indicates an evolution of the C++ type itself.

Definition at line 224 of file RFieldMeta.cxx.

◆ GetValueSize()

size_t ROOT::RClassField::GetValueSize ( ) const

final

The number of bytes taken by a value of the appropriate type.

Definition at line 222 of file RFieldMeta.cxx.

◆ HasDefaultColumnRepresentative()

bool ROOT::RFieldBase::HasDefaultColumnRepresentative ( ) const

inline

Whether or not an explicit column representative was set.

Definition at line 662 of file RFieldBase.hxx.

◆ HasExtraTypeInfo()

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

inlineprotectedvirtual

Definition at line 508 of file RFieldBase.hxx.

◆ HasReadCallbacks()

bool ROOT::RFieldBase::HasReadCallbacks ( ) const

inline

Definition at line 632 of file RFieldBase.hxx.

◆ InvokeReadCallbacks()

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

inlineprivate

Definition at line 243 of file RFieldBase.hxx.

◆ IsArtificial()

bool ROOT::RFieldBase::IsArtificial ( ) const

inline

Definition at line 645 of file RFieldBase.hxx.

◆ IsSimple()

bool ROOT::RFieldBase::IsSimple ( ) const

inline

Definition at line 644 of file RFieldBase.hxx.

◆ LookupMember()

ROOT::DescriptorId_t ROOT::RClassField::LookupMember	(	const ROOT::RNTupleDescriptor &	desc,
		std::string_view	memberName,
		ROOT::DescriptorId_t	classFieldId )

private

Returns the id of member 'name' in the class field given by 'fieldId', or kInvalidDescriptorId if no such member exist.

Looks recursively in base classes.

Definition at line 187 of file RFieldMeta.cxx.

◆ Map()

bool * ROOT::RSimpleField< bool >::Map ( ROOT::NTupleSize_t globalIndex )

inlineinherited

Definition at line 417 of file RField.hxx.

◆ MapV()

bool * ROOT::RSimpleField< bool >::MapV	(	ROOT::NTupleSize_t	globalIndex,
		ROOT::NTupleSize_t &	nItems )

inlineinherited

Definition at line 419 of file RField.hxx.

◆ operator=()

RField & ROOT::RField< bool >::operator= ( RField< bool > && other )

default

◆ PrepareStagingArea()

void ROOT::RClassField::PrepareStagingArea	(	const std::vector< const TSchemaRule * > &	rules,
		const ROOT::RNTupleDescriptor &	desc,
		const ROOT::RFieldDescriptor &	classFieldId )

private

If there are rules with inputs (source members), create the staging area according to the TClass instance that corresponds to the on-disk field.

Definition at line 192 of file RFieldMeta.cxx.

◆ 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 463 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 445 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 486 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.

Definition at line 481 of file RFieldBase.cxx.

◆ ReadGlobalImpl()

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

finalprotected

Definition at line 209 of file RFieldMeta.cxx.

◆ ReadInClusterImpl()

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

finalprotected

Definition at line 210 of file RFieldMeta.cxx.

◆ ReconcileFloatingPointField()

void ROOT::RSimpleField< bool >::ReconcileFloatingPointField ( const RNTupleDescriptor & desc )

privateinherited

Definition at line 387 of file RField.cxx.

◆ ReconcileIntegralField()

void ROOT::RSimpleField< bool >::ReconcileIntegralField ( const RNTupleDescriptor & desc )

privateinherited

Definition at line 386 of file RField.cxx.

◆ ReconcileOnDiskField()

void ROOT::RClassField::ReconcileOnDiskField ( const RNTupleDescriptor & desc )

finalprotected

For non-artificial fields, check compatibility of the in-memory field and the on-disk field.

In the process, the field at hand may change its on-disk ID or perform other tasks related to automatic schema evolution. If the on-disk field is incompatible with the in-memory field at hand, an exception is thrown.

Definition at line 213 of file RFieldMeta.cxx.

◆ RemoveReadCallback()

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

protected

Definition at line 501 of file RFieldBase.cxx.

◆ SetArtificial()

void ROOT::RFieldBase::SetArtificial ( )

inlineprivate

Definition at line 273 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 660 of file RFieldBase.cxx.

◆ SetDescription()

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

Definition at line 648 of file RFieldBase.cxx.

◆ SetOnDiskId()

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

Definition at line 652 of file RFieldBase.cxx.

◆ SetStagingClass()

void ROOT::RClassField::SetStagingClass	(	const std::string &	className,
		unsigned int	classVersion )

private

Sets fStagingClass according to the given name and version.

Definition at line 189 of file RFieldMeta.cxx.

◆ SplitValue()

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

final

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

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

Definition at line 221 of file RFieldMeta.cxx.

◆ TypeName()

std::string ROOT::RField< bool >::TypeName ( )

inlinestatic

Definition at line 72 of file RFieldFundamental.hxx.

Member Data Documentation

◆ fAuxiliaryColumn

ROOT::Internal::RColumn* ROOT::RFieldBase::fAuxiliaryColumn

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 312 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 315 of file RFieldBase.hxx.

◆ fClass

TClass* ROOT::RClassField::fClass

private

Definition at line 164 of file RField.hxx.

◆ fColumnRepresentatives

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

protected

Pointers into the static vector returned by RColumnRepresentations::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 330 of file RFieldBase.hxx.

◆ fDescription

std::string ROOT::RFieldBase::fDescription

private

Free text set by the user.

Definition at line 239 of file RFieldBase.hxx.

◆ fIsArtificial

bool ROOT::RFieldBase::fIsArtificial

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 233 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 229 of file RFieldBase.hxx.

◆ fMaxAlignment

std::size_t ROOT::RClassField::fMaxAlignment

private

Definition at line 167 of file RField.hxx.

◆ fName

std::string ROOT::RFieldBase::fName

private

The field name relative to its parent field.

Definition at line 220 of file RFieldBase.hxx.

◆ fNRepetitions

std::size_t ROOT::RFieldBase::fNRepetitions

private

For fixed sized arrays, the array length.

Definition at line 226 of file RFieldBase.hxx.

◆ fOnDiskId

ROOT::DescriptorId_t ROOT::RFieldBase::fOnDiskId

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 237 of file RFieldBase.hxx.

◆ fOnDiskTypeChecksum

std::uint32_t ROOT::RFieldBase::fOnDiskTypeChecksum

protected

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

Only set for classes with dictionaries.

Definition at line 326 of file RFieldBase.hxx.

◆ fOnDiskTypeVersion

std::uint32_t ROOT::RFieldBase::fOnDiskTypeVersion

protected

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

Definition at line 323 of file RFieldBase.hxx.

◆ fParent

RFieldBase* ROOT::RFieldBase::fParent

protected

Subfields point to their mother field.

Definition at line 302 of file RFieldBase.hxx.

◆ fPrincipalColumn

ROOT::Internal::RColumn* ROOT::RFieldBase::fPrincipalColumn

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 309 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 321 of file RFieldBase.hxx.

◆ fStagingArea

std::unique_ptr<unsigned char[]> ROOT::RClassField::fStagingArea

private

The staging area stores inputs to I/O rules according to the offsets given by the streamer info of "TypeName@@Version".

The area is allocated depending on I/O rules resp. the source members of the I/O rules.

Definition at line 171 of file RField.hxx.

◆ fStagingClass

TClass* ROOT::RClassField::fStagingClass

private

The TClass instance that corresponds to the staging area.

The staging class exists as <class name>@<on-disk version> if the on-disk version is different from the current in-memory version, or it can be accessed by the first @alloc streamer element of the current streamer info.

Definition at line 176 of file RField.hxx.

◆ fStagingItems

std::unordered_map<std::string, RStagingItem> ROOT::RClassField::fStagingItems

private

Lookup staging items by member name.

Definition at line 177 of file RField.hxx.

◆ fState

EState ROOT::RFieldBase::fState

private

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

Definition at line 241 of file RFieldBase.hxx.

◆ fStructure

ROOT::ENTupleStructure ROOT::RFieldBase::fStructure

private

The role of this field in the data model structure.

Definition at line 224 of file RFieldBase.hxx.

◆ fSubfields

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

protected

Collections and classes own subfields.

Definition at line 300 of file RFieldBase.hxx.

◆ fSubfieldsInfo

std::vector<RSubfieldInfo> ROOT::RClassField::fSubfieldsInfo

private

Additional information kept for each entry in fSubfields.

Definition at line 166 of file RField.hxx.

◆ fTraits

std::uint32_t ROOT::RFieldBase::fTraits

protected

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

Definition at line 317 of file RFieldBase.hxx.

◆ fType

std::string ROOT::RFieldBase::fType

private

The C++ type captured by this field.

Definition at line 222 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 319 of file RFieldBase.hxx.

◆ kInvalidTypeVersion

std::uint32_t ROOT::RFieldBase::kInvalidTypeVersion

staticconstexpr

Definition at line 139 of file RFieldBase.hxx.

◆ kPrefixInherited

const char* ROOT::RClassField::kPrefixInherited

staticconstexprprivate

Prefix used in the subfield names generated for base classes.

Definition at line 153 of file RField.hxx.

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

tree/ntuple/inc/ROOT/RField/RFieldFundamental.hxx
tree/ntuple/src/RField.cxx

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Member Typedef Documentation

◆ ColumnRepresentation_t

◆ RConstSchemaIterator

◆ ReadCallback_t

◆ RSchemaIterator

Member Enumeration Documentation

◆ anonymous enum

◆ anonymous enum

◆ EState

| |

◆ ESubfieldRole

Constructor & Destructor Documentation

◆ RField() [1/2]

◆ RField() [2/2]

◆ ~RField()

Member Function Documentation

◆ AcceptVisitor() [1/2]

◆ AcceptVisitor() [2/2]

◆ AddReadCallback()

◆ AddReadCallbacksFromIORule()

◆ Append()

◆ AppendImpl()

◆ Attach() [1/2]

◆ Attach() [2/2]

◆ AutoAdjustColumnTypes()

◆ BeforeConnectPageSource()

◆ begin() [1/2]

◆ begin() [2/2]

◆ BindValue()

◆ CallAppendOn()

◆ CallConstructValueOn()

◆ CallCreateObjectRawPtrOn()

◆ CallReadOn() [1/2]

◆ CallReadOn() [2/2]

◆ CallSetArtificialOn()

◆ cbegin()

◆ cend()

◆ Check()

◆ Clone()

◆ CloneImpl() [1/2]

◆ CloneImpl() [2/2]

◆ CommitCluster()

◆ CommitClusterImpl()

◆ CompareOnDiskField()

◆ 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()

◆ EnsureMatchingOnDiskCollection()

◆ EnsureMatchingOnDiskField()

◆ EnsureMatchingTypePrefix()

◆ EntryToColumnElementIndex()

◆ FindRules()

◆ FlushColumns()

◆ GenerateColumns() [1/2]

◆ GenerateColumns() [2/2]

◆ GenerateColumnsImpl() [1/3]

◆ GenerateColumnsImpl() [2/3]