The field for a class with dictionary.

Definition at line 759 of file RField.hxx.

Classes
class	RClassDeleter

struct	RSubFieldInfo

Public Member Functions
	RClassField (RClassField &&other)=default

	RClassField (std::string_view fieldName, std::string_view className)

	~RClassField () override=default

void	AcceptVisitor (Detail::RFieldVisitor &visitor) const override

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

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

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

RClassField &	operator= (RClassField &&other)=default

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

Public Member Functions inherited from ROOT::Experimental::RFieldBase
	RFieldBase (const RFieldBase &)=delete

	RFieldBase (RFieldBase &&)=default

	RFieldBase (std::string_view name, std::string_view type, 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

RSchemaIterator	begin ()

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<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 RFieldBase::RCreateObjectDeleter< void >::deleter >	CreateObject () const

template<>
std::unique_ptr< void, typename ROOT::Experimental::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 ()

const ColumnRepresentation_t &	GetColumnRepresentative () const
	Returns the fColumnRepresentative pointee or, if unset, the field's default representative.

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

std::string	GetFieldName () const

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

NTupleSize_t	GetNElements () const

std::size_t	GetNRepetitions () const

DescriptorId_t	GetOnDiskId () const

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

ENTupleStructure	GetStructure () const

std::vector< RFieldBase * >	GetSubFields ()

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

int	GetTraits () const

std::string	GetTypeAlias () const

std::string	GetTypeName () const

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

bool	HasReadCallbacks () const

bool	IsSimple () const

RFieldBase &	operator= (const RFieldBase &)=delete

RFieldBase &	operator= (RFieldBase &&)=default

void	SetColumnRepresentative (const ColumnRepresentation_t &representative)
	Fixes a column representative.

void	SetDescription (std::string_view description)

void	SetOnDiskId (DescriptorId_t id)

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

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

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

void	GenerateColumnsImpl () final
	Creates the backing columns corresponsing to the field type for writing.

void	GenerateColumnsImpl (const RNTupleDescriptor &) final
	Creates the backing columns corresponsing to the field type for reading.

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

void	OnConnectPageSource () final
	Called by `ConnectPageSource()` only once connected; derived classes may override this as appropriate.

void	ReadGlobalImpl (NTupleSize_t globalIndex, void *to) final

void	ReadInClusterImpl (RClusterIndex clusterIndex, void *to) final

Protected Member Functions inherited from ROOT::Experimental::RFieldBase
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.

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

void	AutoAdjustColumnTypes (const 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	CommitClusterImpl ()

const ColumnRepresentation_t &	EnsureCompatibleColumnTypes (const RNTupleDescriptor &desc) const
	Returns the on-disk column types found in the provided descriptor for fOnDiskId.

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

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

void	Read (RClusterIndex clusterIndex, void *to)

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	RemoveReadCallback (size_t idx)

Private Types
enum	ESubFieldRole { kBaseClass , kDataMember }

Private Member Functions
	RClassField (std::string_view fieldName, std::string_view className, TClass *classp)

void	AddReadCallbacksFromIORules (const std::span< const TSchemaRule * > rules, TClass *classp=nullptr)
	Register post-read callbacks corresponding to a list of ROOT I/O customization rules.

void	Attach (std::unique_ptr< RFieldBase > child, RSubFieldInfo info)

Private Attributes
TClass *	fClass

std::size_t	fMaxAlignment = 1

std::vector< RSubFieldInfo >	fSubFieldsInfo
	Additional information kept for each entry in `fSubFields`

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

Additional Inherited Members
Public Types inherited from ROOT::Experimental::RFieldBase
using	ColumnRepresentation_t = std::vector< EColumnType >

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 >

Static Public Member Functions inherited from ROOT::Experimental::RFieldBase
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 resurrect a field from the stored on-disk type information.

static RResult< void >	EnsureValidFieldName (std::string_view fieldName)
	Check whether a given string is a valid field name.

Static Public Attributes inherited from ROOT::Experimental::RFieldBase
static constexpr std::uint32_t	kInvalidTypeVersion = -1U

static constexpr int	kTraitMappable = 0x04
	A field of a fundamental type that can be directly mapped via `RField<T>::Map()`, i.e.

static constexpr int	kTraitTriviallyConstructible = 0x01
	No constructor needs to be called, i.e.

static constexpr int	kTraitTriviallyDestructible = 0x02
	The type is cleaned up just by freeing its memory. I.e. the destructor performs a no-op.

static constexpr int	kTraitTrivialType = kTraitTriviallyConstructible \| kTraitTriviallyDestructible
	Shorthand for types that are both trivially constructible and destructible.

Static Protected Member Functions inherited from ROOT::Experimental::RFieldBase
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	CallReadOn (RFieldBase &other, NTupleSize_t globalIndex, void *to)

static void	CallReadOn (RFieldBase &other, RClusterIndex clusterIndex, void *to)

static RResult< std::unique_ptr< RFieldBase > >	Create (const std::string &fieldName, const std::string &canonicalType, const std::string &typeAlias, bool fContinueOnError=false)
	Factory method to resurrect a field from the stored on-disk type information.

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

static 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 inherited from ROOT::Experimental::RFieldBase
const ColumnRepresentation_t *	fColumnRepresentative = nullptr
	Points into the static vector GetColumnRepresentations().GetSerializationTypes() when SetColumnRepresentative is called.

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

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.

Internal::RColumn *	fPrincipalColumn
	Points into fColumns.

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.

int	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.

#include <ROOT/RField.hxx>

Inheritance diagram for ROOT::Experimental::RClassField:

[legend]

Member Enumeration Documentation

◆ ESubFieldRole

enum ROOT::Experimental::RClassField::ESubFieldRole

private

Enumerator
kBaseClass
kDataMember

Definition at line 761 of file RField.hxx.

Constructor & Destructor Documentation

◆ RClassField() [1/3]

ROOT::Experimental::RClassField::RClassField	(	std::string_view	fieldName,
		std::string_view	className,
		TClass *	classp
	)

private

Definition at line 1565 of file RField.cxx.

◆ RClassField() [2/3]

ROOT::Experimental::RClassField::RClassField	(	std::string_view	fieldName,
		std::string_view	className
	)

Definition at line 1560 of file RField.cxx.

◆ RClassField() [3/3]

ROOT::Experimental::RClassField::RClassField ( RClassField && other )

default

◆ ~RClassField()

ROOT::Experimental::RClassField::~RClassField ( )

overridedefault

Member Function Documentation

◆ AcceptVisitor()

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

overridevirtual

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 1747 of file RField.cxx.

◆ AddReadCallbacksFromIORules()

void ROOT::Experimental::RClassField::AddReadCallbacksFromIORules	(	const std::span< const TSchemaRule * >	rules,
		TClass *	classp = `nullptr`
	)

private

Register post-read callbacks corresponding to a list of ROOT I/O customization rules.

classp is used to fill the TVirtualObject instance passed to the user function.

Definition at line 1636 of file RField.cxx.

◆ AppendImpl()

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

finalprotectedvirtual

Operations on values of complex types, e.g.

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

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 1664 of file RField.cxx.

◆ Attach()

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

private

Definition at line 1629 of file RField.cxx.

◆ CloneImpl()

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

finalprotectedvirtual

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

Implements ROOT::Experimental::RFieldBase.

Definition at line 1657 of file RField.cxx.

◆ ConstructValue()

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

overrideprotectedvirtual

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

Implements ROOT::Experimental::RFieldBase.

Reimplemented in ROOT::Experimental::RField< T, typename >.

Definition at line 1713 of file RField.cxx.

◆ GenerateColumnsImpl() [1/2]

void ROOT::Experimental::RClassField::GenerateColumnsImpl ( )

inlinefinalprotectedvirtual

Creates the backing columns corresponsing to the field type for writing.

Implements ROOT::Experimental::RFieldBase.

Definition at line 795 of file RField.hxx.

◆ GenerateColumnsImpl() [2/2]

void ROOT::Experimental::RClassField::GenerateColumnsImpl ( const RNTupleDescriptor & desc )

inlinefinalprotectedvirtual

Creates the backing columns corresponsing to the field type for reading.

The method should to check, using the page source and fOnDiskId, if the column types match and throw if they don't.

Implements ROOT::Experimental::RFieldBase.

Definition at line 796 of file RField.hxx.

◆ GetAlignment()

size_t ROOT::Experimental::RClassField::GetAlignment ( ) const

inlinefinalvirtual

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.

Implements ROOT::Experimental::RFieldBase.

Definition at line 814 of file RField.hxx.

◆ GetDeleter()

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

inlinefinalprotectedvirtual

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 799 of file RField.hxx.

◆ GetTypeVersion()

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

finalvirtual

Indicates an evolution of the C++ type itself.

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 1742 of file RField.cxx.

◆ GetValueSize()

size_t ROOT::Experimental::RClassField::GetValueSize ( ) const

overridevirtual

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

Implements ROOT::Experimental::RFieldBase.

Definition at line 1737 of file RField.cxx.

◆ OnConnectPageSource()

void ROOT::Experimental::RClassField::OnConnectPageSource ( )

finalprotectedvirtual

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

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 1687 of file RField.cxx.

◆ operator=()

RClassField & ROOT::Experimental::RClassField::operator= ( RClassField && other )

default

◆ ReadGlobalImpl()

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

finalprotectedvirtual

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 1673 of file RField.cxx.

◆ ReadInClusterImpl()

void ROOT::Experimental::RClassField::ReadInClusterImpl	(	RClusterIndex	clusterIndex,
		void *	to
	)

finalprotectedvirtual

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 1680 of file RField.cxx.

◆ SplitValue()

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

finalvirtual

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 from ROOT::Experimental::RFieldBase.

Definition at line 1725 of file RField.cxx.

Member Data Documentation

◆ fClass

TClass* ROOT::Experimental::RClassField::fClass

private

Definition at line 781 of file RField.hxx.

◆ fMaxAlignment

std::size_t ROOT::Experimental::RClassField::fMaxAlignment = 1

private

Definition at line 784 of file RField.hxx.

◆ fSubFieldsInfo

std::vector<RSubFieldInfo> ROOT::Experimental::RClassField::fSubFieldsInfo

private

Additional information kept for each entry in fSubFields

Definition at line 783 of file RField.hxx.

◆ kPrefixInherited

constexpr const char* ROOT::Experimental::RClassField::kPrefixInherited {":"}

staticconstexprprivate

Prefix used in the subfield names generated for base classes.

Definition at line 770 of file RField.hxx.

Libraries for ROOT::Experimental::RClassField:

[legend]

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

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

Classes

Public Member Functions

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Additional Inherited Members

Member Enumeration Documentation

◆ ESubFieldRole

Constructor & Destructor Documentation

◆ RClassField() [1/3]

◆ RClassField() [2/3]

◆ RClassField() [3/3]

◆ ~RClassField()

Member Function Documentation

◆ AcceptVisitor()

◆ AddReadCallbacksFromIORules()

◆ AppendImpl()

◆ Attach()

◆ CloneImpl()

◆ ConstructValue()

◆ GenerateColumnsImpl() [1/2]

◆ GenerateColumnsImpl() [2/2]

◆ GetAlignment()

◆ GetDeleter()

◆ GetTypeVersion()

◆ GetValueSize()

◆ OnConnectPageSource()

◆ operator=()

◆ ReadGlobalImpl()

◆ ReadInClusterImpl()

◆ SplitValue()

Member Data Documentation

◆ fClass

◆ fMaxAlignment

◆ fSubFieldsInfo

◆ kPrefixInherited