The field for an untyped record.

The subfields are stored consequitively in a memory block, i.e. the memory layout is identical to one that a C++ struct would have

Definition at line 889 of file RField.hxx.

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

	RRecordField (std::string_view fieldName, std::vector< std::unique_ptr< Detail::RFieldBase > > &&itemFields)
	Construct a RRecordField based on a vector of child fields.

	RRecordField (std::string_view fieldName, std::vector< std::unique_ptr< Detail::RFieldBase > > &itemFields)

	~RRecordField () override=default

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

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

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

RRecordField &	operator= (RRecordField &&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::Detail::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 ()

RSchemaIterator	begin ()

RValue	BindValue (void *where)
	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.

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

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

void	ConnectPageSource (RPageSource &pageSource)

RSchemaIterator	end ()

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

RValue	GenerateValue ()
	Generates an object of the field type and allocates new initialized memory according to the type.

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.

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

std::string	GetName () const

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()`

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 () const

int	GetTraits () const

std::string	GetType () const

std::string	GetTypeAlias () const

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

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
template<std::size_t N>
	RRecordField (std::string_view fieldName, std::array< std::unique_ptr< Detail::RFieldBase >, N > &&itemFields, const std::array< std::size_t, N > &offsets, std::string_view typeName="")

	RRecordField (std::string_view fieldName, std::vector< std::unique_ptr< Detail::RFieldBase > > &&itemFields, const std::vector< std::size_t > &offsets, std::string_view typeName="")

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

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

void	DestroyValue (void *objPtr, bool dtorOnly=false) const override
	Releases the resources acquired during GenerateValue (memory and constructor) This implementation works for types with a trivial destructor and should be overwritten otherwise.

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.

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

std::size_t	GetItemPadding (std::size_t baseOffset, std::size_t itemAlignment) const

void	ReadGlobalImpl (NTupleSize_t globalIndex, void *to) final

void	ReadInClusterImpl (const RClusterIndex &clusterIndex, void *to) final

Protected Member Functions inherited from ROOT::Experimental::Detail::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< Detail::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.

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

void	Read (const RClusterIndex &clusterIndex, void *to)

void	Read (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	RemoveReadCallback (size_t idx)

Protected Attributes
std::size_t	fMaxAlignment = 1

std::vector< std::size_t >	fOffsets

std::size_t	fSize = 0

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

std::vector< std::unique_ptr< 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.

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.

Additional Inherited Members
Public Types inherited from ROOT::Experimental::Detail::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::Detail::RFieldBase
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::Detail::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. DestroyValue() is 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::Detail::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	CallDestroyValueOn (const RFieldBase &other, void *objPtr, bool dtorOnly=false)

static void	CallGenerateValueOn (const RFieldBase &other, void *where)
	Allow derived classes to call GenerateValue(void *) and DestroyValue on other (sub) fields.

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

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

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

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

#include <ROOT/RField.hxx>

Inheritance diagram for ROOT::Experimental::RRecordField:

[legend]

Constructor & Destructor Documentation

◆ RRecordField() [1/5]

ROOT::Experimental::RRecordField::RRecordField	(	std::string_view	fieldName,
		std::vector< std::unique_ptr< Detail::RFieldBase > > &&	itemFields,
		const std::vector< std::size_t > &	offsets,
		std::string_view	typeName = `""`
	)

protected

Definition at line 1680 of file RField.cxx.

◆ RRecordField() [2/5]

template<std::size_t N>

ROOT::Experimental::RRecordField::RRecordField	(	std::string_view	fieldName,
		std::array< std::unique_ptr< Detail::RFieldBase >, N > &&	itemFields,
		const std::array< std::size_t, N > &	offsets,
		std::string_view	typeName = `""`
	)

inlineprotected

Definition at line 913 of file RField.hxx.

◆ RRecordField() [3/5]

ROOT::Experimental::RRecordField::RRecordField	(	std::string_view	fieldName,
		std::vector< std::unique_ptr< Detail::RFieldBase > > &&	itemFields
	)

Construct a RRecordField based on a vector of child fields.

The ownership of the child fields is transferred to the RRecordField instance.

Definition at line 1695 of file RField.cxx.

◆ RRecordField() [4/5]

ROOT::Experimental::RRecordField::RRecordField	(	std::string_view	fieldName,
		std::vector< std::unique_ptr< Detail::RFieldBase > > &	itemFields
	)

Definition at line 1713 of file RField.cxx.

◆ RRecordField() [5/5]

ROOT::Experimental::RRecordField::RRecordField ( RRecordField && other )

default

◆ ~RRecordField()

ROOT::Experimental::RRecordField::~RRecordField ( )

overridedefault

Member Function Documentation

◆ AcceptVisitor()

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

finalvirtual

Reimplemented from ROOT::Experimental::Detail::RFieldBase.

Definition at line 1787 of file RField.cxx.

◆ AppendImpl()

std::size_t ROOT::Experimental::RRecordField::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::Detail::RFieldBase.

Definition at line 1738 of file RField.cxx.

◆ CloneImpl()

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

overrideprotectedvirtual

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

Implements ROOT::Experimental::Detail::RFieldBase.

Reimplemented in ROOT::Experimental::RTupleField.

Definition at line 1730 of file RField.cxx.

◆ DestroyValue()

void ROOT::Experimental::RRecordField::DestroyValue	(	void *	objPtr,
		bool	dtorOnly = `false`
	)		const

overrideprotectedvirtual

Releases the resources acquired during GenerateValue (memory and constructor) This implementation works for types with a trivial destructor and should be overwritten otherwise.

Reimplemented from ROOT::Experimental::Detail::RFieldBase.

Reimplemented in ROOT::Experimental::RTupleField.

Definition at line 1768 of file RField.cxx.

◆ GenerateColumnsImpl() [1/2]

void ROOT::Experimental::RRecordField::GenerateColumnsImpl ( )

inlinefinalprotectedvirtual

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

Implements ROOT::Experimental::Detail::RFieldBase.

Definition at line 899 of file RField.hxx.

◆ GenerateColumnsImpl() [2/2]

void ROOT::Experimental::RRecordField::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::Detail::RFieldBase.

Definition at line 900 of file RField.hxx.

◆ GenerateValue()

void ROOT::Experimental::RRecordField::GenerateValue ( void * where ) const

overrideprotectedvirtual

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

Implements ROOT::Experimental::Detail::RFieldBase.

Reimplemented in ROOT::Experimental::RTupleField.

Definition at line 1761 of file RField.cxx.

◆ GetAlignment()

size_t ROOT::Experimental::RRecordField::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::Detail::RFieldBase.

Definition at line 938 of file RField.hxx.

◆ GetItemPadding()

std::size_t ROOT::Experimental::RRecordField::GetItemPadding	(	std::size_t	baseOffset,
		std::size_t	itemAlignment
	)		const

protected

Definition at line 1719 of file RField.cxx.

◆ GetValueSize()

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

inlinefinalvirtual

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

Implements ROOT::Experimental::Detail::RFieldBase.

Definition at line 937 of file RField.hxx.

◆ operator=()

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

default

◆ ReadGlobalImpl()

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

finalprotectedvirtual

Reimplemented from ROOT::Experimental::Detail::RFieldBase.

Definition at line 1747 of file RField.cxx.

◆ ReadInClusterImpl()

void ROOT::Experimental::RRecordField::ReadInClusterImpl	(	const RClusterIndex &	clusterIndex,
		void *	to
	)

finalprotectedvirtual

Reimplemented from ROOT::Experimental::Detail::RFieldBase.

Definition at line 1754 of file RField.cxx.

◆ SplitValue()

std::vector< ROOT::Experimental::Detail::RFieldBase::RValue > ROOT::Experimental::RRecordField::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::Detail::RFieldBase.

Definition at line 1777 of file RField.cxx.

Member Data Documentation

◆ fMaxAlignment

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

protected

Definition at line 891 of file RField.hxx.

◆ fOffsets

std::vector<std::size_t> ROOT::Experimental::RRecordField::fOffsets

protected

Definition at line 893 of file RField.hxx.

◆ fSize

std::size_t ROOT::Experimental::RRecordField::fSize = 0

protected

Definition at line 892 of file RField.hxx.

Libraries for ROOT::Experimental::RRecordField:

[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

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RRecordField() [1/5]

◆ RRecordField() [2/5]

◆ RRecordField() [3/5]

◆ RRecordField() [4/5]

◆ RRecordField() [5/5]

◆ ~RRecordField()

Member Function Documentation

◆ AcceptVisitor()

◆ AppendImpl()

◆ CloneImpl()

◆ DestroyValue()

◆ GenerateColumnsImpl() [1/2]

◆ GenerateColumnsImpl() [2/2]

◆ GenerateValue()

◆ GetAlignment()

◆ GetItemPadding()

◆ GetValueSize()

◆ operator=()

◆ ReadGlobalImpl()

◆ ReadInClusterImpl()

◆ SplitValue()

Member Data Documentation

◆ fMaxAlignment

◆ fOffsets

◆ fSize