Logo ROOT  
Reference Guide
 
Loading...
Searching...
No Matches
ROOT::Experimental::Internal::RArraySizeField Class Referencefinal

An artificial field that provides the size of a fixed-size array.

This is the implementation of R_rdf_sizeof_column in case column contains fixed-size arrays on disk.

Definition at line 119 of file RNTupleDS.cxx.

Public Member Functions

 RArraySizeField (const RArraySizeField &other)=delete
 
 RArraySizeField (RArraySizeField &&other)=default
 
 RArraySizeField (std::size_t arrayLength)
 
 ~RArraySizeField () final=default
 
void ConstructValue (void *where) const final
 Constructs value in a given location of size at least GetValueSize(). Called by the base class' CreateValue().
 
std::size_t GetAlignment () const final
 As a rule of thumb, the alignment is equal to the size of the type.
 
std::size_t GetValueSize () const final
 The number of bytes taken by a value of the appropriate type.
 
RArraySizeFieldoperator= (const RArraySizeField &other)=delete
 
RArraySizeFieldoperator= (RArraySizeField &&other)=default
 
- 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
 
virtual void AcceptVisitor (Detail::RFieldVisitor &visitor) const
 
RSchemaIterator begin ()
 
RConstSchemaIterator begin () const
 
RValue BindValue (std::shared_ptr< void > objPtr)
 Creates a value from a memory location with an already constructed object.
 
RConstSchemaIterator cbegin () const
 
RConstSchemaIterator cend () const
 
std::unique_ptr< RFieldBaseClone (std::string_view newName) const
 Copies the field and its sub fields using a possibly new name and a new, unconnected set of columns.
 
RBulk CreateBulk ()
 The returned bulk is initially empty; RBulk::ReadBulk will construct the array of values.
 
template<>
std::unique_ptr< void, typename RFieldBase::RCreateObjectDeleter< void >::deleter > CreateObject () const
 
template<typename T >
std::unique_ptr< T, typename RCreateObjectDeleter< T >::deleter > CreateObject () const
 Generates an object of the field type and allocates new initialized memory according to the type.
 
template<>
std::unique_ptr< void, typename ROOT::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 ()
 
RConstSchemaIterator end () const
 
RColumnRepresentations::Selection_t GetColumnRepresentatives () const
 Returns the fColumnRepresentative pointee or, if unset, the field's default representative.
 
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::size_t GetNRepetitions () const
 
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 RFieldBaseGetParent () 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
 
const std::string & GetTypeAlias () const
 
virtual std::uint32_t GetTypeChecksum () const
 Return the current TClass reported checksum of this class. Only valid if kTraitTypeChecksum is set.
 
const std::string & GetTypeName () const
 
virtual std::uint32_t GetTypeVersion () const
 Indicates an evolution of the C++ type itself.
 
bool HasDefaultColumnRepresentative () const
 Whether or not an explicit column representative was set.
 
bool HasReadCallbacks () const
 
bool IsSimple () const
 
RFieldBaseoperator= (const RFieldBase &)=delete
 
RFieldBaseoperator= (RFieldBase &&)=default
 
void SetColumnRepresentatives (const RColumnRepresentations::Selection_t &representatives)
 Fixes a column representative.
 
void SetDescription (std::string_view description)
 
void SetOnDiskId (DescriptorId_t id)
 
virtual std::vector< RValueSplitValue (const RValue &value) const
 Creates the list of direct child values given a value for this field.
 

Private Member Functions

std::unique_ptr< ROOT::Experimental::RFieldBaseCloneImpl (std::string_view) const final
 Called by Clone(), which additionally copies the on-disk ID.
 
void GenerateColumns () final
 Implementations in derived classes should create the backing columns corresponsing to the field type for writing.
 
void GenerateColumns (const ROOT::Experimental::RNTupleDescriptor &) final
 Implementations in derived classes should create the backing columns corresponsing to the field type for reading.
 
void ReadGlobalImpl (NTupleSize_t, void *to) final
 
void ReadInClusterImpl (RClusterIndex, void *to) final
 

Private Attributes

std::size_t fArrayLength
 

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< RCheckResultCheck (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 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 constexpr int kTraitTypeChecksum = 0x08
 The TClass checksum is set and valid.
 
- 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.
 
virtual std::size_t AppendImpl (const void *from)
 Operations on values of complex types, e.g.
 
void Attach (std::unique_ptr< RFieldBase > child)
 Add a new subfield to the list of nested fields.
 
void AutoAdjustColumnTypes (const 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 ()
 
void * CreateObjectRawPtr () const
 Factory method for the field's type. The caller owns the returned pointer.
 
const ColumnRepresentation_tEnsureCompatibleColumnTypes (const 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.
 
template<typename... ColumnCppTs>
void GenerateColumnsImpl ()
 For writing, use the currently set column representative.
 
template<std::uint32_t ColumnIndexT, typename HeadT , typename... TailTs>
void GenerateColumnsImpl (const ColumnRepresentation_t &representation, std::uint16_t representationIndex)
 Helpers for generating columns.
 
template<typename... ColumnCppTs>
void GenerateColumnsImpl (const RNTupleDescriptor &desc)
 For reading, use the on-disk column list.
 
virtual const RColumnRepresentationsGetColumnRepresentations () const
 Implementations in derived classes should return a static RColumnRepresentations object.
 
virtual std::unique_ptr< RDeleterGetDeleter () const
 
virtual RExtraTypeInfoDescriptor GetExtraTypeInfo () const
 
virtual bool HasExtraTypeInfo () const
 
virtual void OnConnectPageSource ()
 Called by ConnectPageSource() once connected; derived classes may override this as appropriate.
 
void Read (NTupleSize_t globalIndex, void *to)
 Populate a single value with data from the field.
 
void Read (RClusterIndex clusterIndex, 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)
 
- 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 * CallCreateObjectRawPtrOn (RFieldBase &other)
 
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 continueOnError=false)
 Factory method to resurrect a field from the stored on-disk type information.
 
static std::unique_ptr< RDeleterGetDeleterOf (const RFieldBase &other)
 
static Internal::RColumnGetPrincipalColumnOf (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
Internal::RColumnfAuxiliaryColumn = nullptr
 Some fields have a second column in its column representation.
 
std::vector< std::unique_ptr< Internal::RColumn > > fAvailableColumns
 The columns are connected either to a sink or to a source (not to both); they are owned by the field.
 
std::vector< std::reference_wrapper< const ColumnRepresentation_t > > fColumnRepresentatives
 Pointers into the static vector GetColumnRepresentations().GetSerializationTypes() when SetColumnRepresentatives is called.
 
std::uint32_t fOnDiskTypeChecksum = 0
 TClass checksum cached from the descriptor after a call to ConnectPageSource().
 
std::uint32_t fOnDiskTypeVersion = kInvalidTypeVersion
 C++ type version cached from the descriptor after a call to ConnectPageSource()
 
RFieldBasefParent
 Sub fields point to their mother field.
 
Internal::RColumnfPrincipalColumn = nullptr
 All fields that have columns have a distinct main column.
 
std::vector< ReadCallback_tfReadCallbacks
 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.
 
Inheritance diagram for ROOT::Experimental::Internal::RArraySizeField:
[legend]

Constructor & Destructor Documentation

◆ RArraySizeField() [1/3]

ROOT::Experimental::Internal::RArraySizeField::RArraySizeField ( std::size_t  arrayLength)
inline

Definition at line 136 of file RNTupleDS.cxx.

◆ RArraySizeField() [2/3]

ROOT::Experimental::Internal::RArraySizeField::RArraySizeField ( const RArraySizeField other)
delete

◆ RArraySizeField() [3/3]

ROOT::Experimental::Internal::RArraySizeField::RArraySizeField ( RArraySizeField &&  other)
default

◆ ~RArraySizeField()

ROOT::Experimental::Internal::RArraySizeField::~RArraySizeField ( )
finaldefault

Member Function Documentation

◆ CloneImpl()

std::unique_ptr< ROOT::Experimental::RFieldBase > ROOT::Experimental::Internal::RArraySizeField::CloneImpl ( std::string_view  newName) const
inlinefinalprivatevirtual

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

Implements ROOT::Experimental::RFieldBase.

Definition at line 123 of file RNTupleDS.cxx.

◆ ConstructValue()

void ROOT::Experimental::Internal::RArraySizeField::ConstructValue ( void *  where) const
inlinefinalvirtual

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

Implements ROOT::Experimental::RFieldBase.

Definition at line 147 of file RNTupleDS.cxx.

◆ GenerateColumns() [1/2]

void ROOT::Experimental::Internal::RArraySizeField::GenerateColumns ( )
inlinefinalprivatevirtual

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

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

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 127 of file RNTupleDS.cxx.

◆ GenerateColumns() [2/2]

void ROOT::Experimental::Internal::RArraySizeField::GenerateColumns ( const ROOT::Experimental::RNTupleDescriptor )
inlinefinalprivatevirtual

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

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

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 128 of file RNTupleDS.cxx.

◆ GetAlignment()

std::size_t ROOT::Experimental::Internal::RArraySizeField::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 149 of file RNTupleDS.cxx.

◆ GetValueSize()

std::size_t ROOT::Experimental::Internal::RArraySizeField::GetValueSize ( ) const
inlinefinalvirtual

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

Implements ROOT::Experimental::RFieldBase.

Definition at line 148 of file RNTupleDS.cxx.

◆ operator=() [1/2]

RArraySizeField & ROOT::Experimental::Internal::RArraySizeField::operator= ( const RArraySizeField other)
delete

◆ operator=() [2/2]

RArraySizeField & ROOT::Experimental::Internal::RArraySizeField::operator= ( RArraySizeField &&  other)
default

◆ ReadGlobalImpl()

void ROOT::Experimental::Internal::RArraySizeField::ReadGlobalImpl ( NTupleSize_t  ,
void *  to 
)
inlinefinalprivatevirtual

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 129 of file RNTupleDS.cxx.

◆ ReadInClusterImpl()

void ROOT::Experimental::Internal::RArraySizeField::ReadInClusterImpl ( RClusterIndex  ,
void *  to 
)
inlinefinalprivatevirtual

Reimplemented from ROOT::Experimental::RFieldBase.

Definition at line 130 of file RNTupleDS.cxx.

Member Data Documentation

◆ fArrayLength

std::size_t ROOT::Experimental::Internal::RArraySizeField::fArrayLength
private

Definition at line 121 of file RNTupleDS.cxx.

  • tree/dataframe/src/RNTupleDS.cxx