ROOT::Experimental::RColumnDescriptor Class Reference

Meta-data stored for every column of an ntuple.

Definition at line 154 of file RNTupleDescriptor.hxx.

Classes
struct	RValueRange

Public Member Functions
	RColumnDescriptor ()=default
	RColumnDescriptor (const RColumnDescriptor &other)=delete
	RColumnDescriptor (RColumnDescriptor &&other)=default
RColumnDescriptor	Clone () const
	Get a copy of the descriptor.
std::uint16_t	GetBitsOnStorage () const
ROOT::DescriptorId_t	GetFieldId () const
std::uint64_t	GetFirstElementIndex () const
std::uint32_t	GetIndex () const
ROOT::DescriptorId_t	GetLogicalId () const
ROOT::DescriptorId_t	GetPhysicalId () const
std::uint16_t	GetRepresentationIndex () const
ROOT::ENTupleColumnType	GetType () const
std::optional< RValueRange >	GetValueRange () const
bool	IsAliasColumn () const
bool	IsDeferredColumn () const
bool	IsSuppressedDeferredColumn () const
RColumnDescriptor &	operator= (const RColumnDescriptor &other)=delete
RColumnDescriptor &	operator= (RColumnDescriptor &&other)=default
bool	operator== (const RColumnDescriptor &other) const

Private Attributes
std::uint16_t	fBitsOnStorage = 0
	The size in bits of elements of this column.
ROOT::DescriptorId_t	fFieldId = ROOT::kInvalidDescriptorId
	Every column belongs to one and only one field.
std::int64_t	fFirstElementIndex = 0U
	The absolute value specifies the index for the first stored element for this column.
std::uint32_t	fIndex = 0
	A field can be serialized into several columns, which are numbered from zero to $n$.
ROOT::DescriptorId_t	fLogicalColumnId = ROOT::kInvalidDescriptorId
	The actual column identifier, which is the link to the corresponding field.
ROOT::DescriptorId_t	fPhysicalColumnId = ROOT::kInvalidDescriptorId
	Usually identical to the logical column ID, except for alias columns where it references the shadowed column.
std::uint16_t	fRepresentationIndex = 0
	A field may use multiple column representations, which are numbered from zero to $m$.
ROOT::ENTupleColumnType	fType = ROOT::ENTupleColumnType::kUnknown
	The on-disk column type.
std::optional< RValueRange >	fValueRange
	Optional value range (used e.g. by quantized real fields)

Friends
class	Internal::RColumnDescriptorBuilder
class	Internal::RNTupleDescriptorBuilder

#include <ROOT/RNTupleDescriptor.hxx>

Constructor & Destructor Documentation

RColumnDescriptor() [1/3]

ROOT::Experimental::RColumnDescriptor::RColumnDescriptor ( )

default

RColumnDescriptor() [2/3]

ROOT::Experimental::RColumnDescriptor::RColumnDescriptor ( const RColumnDescriptor & other )

delete

RColumnDescriptor() [3/3]

ROOT::Experimental::RColumnDescriptor::RColumnDescriptor ( RColumnDescriptor && other )

default

Member Function Documentation

Clone()

ROOT::Experimental::RColumnDescriptor ROOT::Experimental::RColumnDescriptor::Clone

(

)

const

Get a copy of the descriptor.

Definition at line 180 of file RNTupleDescriptor.cxx.

GetBitsOnStorage()

std::uint16_t ROOT::Experimental::RColumnDescriptor::GetBitsOnStorage ( ) const

inline

Definition at line 211 of file RNTupleDescriptor.hxx.

GetFieldId()

ROOT::DescriptorId_t ROOT::Experimental::RColumnDescriptor::GetFieldId ( ) const

inline

Definition at line 207 of file RNTupleDescriptor.hxx.

GetFirstElementIndex()

std::uint64_t ROOT::Experimental::RColumnDescriptor::GetFirstElementIndex ( ) const

inline

Definition at line 210 of file RNTupleDescriptor.hxx.

GetIndex()

std::uint32_t ROOT::Experimental::RColumnDescriptor::GetIndex ( ) const

inline

Definition at line 208 of file RNTupleDescriptor.hxx.

GetLogicalId()

ROOT::DescriptorId_t ROOT::Experimental::RColumnDescriptor::GetLogicalId ( ) const

inline

Definition at line 205 of file RNTupleDescriptor.hxx.

GetPhysicalId()

ROOT::DescriptorId_t ROOT::Experimental::RColumnDescriptor::GetPhysicalId ( ) const

inline

Definition at line 206 of file RNTupleDescriptor.hxx.

GetRepresentationIndex()

std::uint16_t ROOT::Experimental::RColumnDescriptor::GetRepresentationIndex ( ) const

inline

Definition at line 209 of file RNTupleDescriptor.hxx.

GetType()

ROOT::ENTupleColumnType ROOT::Experimental::RColumnDescriptor::GetType ( ) const

inline

Definition at line 212 of file RNTupleDescriptor.hxx.

GetValueRange()

std::optional< RValueRange > ROOT::Experimental::RColumnDescriptor::GetValueRange ( ) const

inline

Definition at line 213 of file RNTupleDescriptor.hxx.

IsAliasColumn()

bool ROOT::Experimental::RColumnDescriptor::IsAliasColumn ( ) const

inline

Definition at line 214 of file RNTupleDescriptor.hxx.

IsDeferredColumn()

bool ROOT::Experimental::RColumnDescriptor::IsDeferredColumn ( ) const

inline

Definition at line 215 of file RNTupleDescriptor.hxx.

IsSuppressedDeferredColumn()

bool ROOT::Experimental::RColumnDescriptor::IsSuppressedDeferredColumn ( ) const

inline

Definition at line 216 of file RNTupleDescriptor.hxx.

operator=() [1/2]

RColumnDescriptor & ROOT::Experimental::RColumnDescriptor::operator= ( const RColumnDescriptor & other )

delete

operator=() [2/2]

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

default

operator==()

bool ROOT::Experimental::RColumnDescriptor::operator==

(

const RColumnDescriptor &

other

)

const

Definition at line 172 of file RNTupleDescriptor.cxx.

Friends And Related Symbol Documentation

Internal::RColumnDescriptorBuilder

friend class Internal::RColumnDescriptorBuilder

friend

Definition at line 155 of file RNTupleDescriptor.hxx.

Internal::RNTupleDescriptorBuilder

friend class Internal::RNTupleDescriptorBuilder

friend

Definition at line 156 of file RNTupleDescriptor.hxx.

Member Data Documentation

fBitsOnStorage

std::uint16_t ROOT::Experimental::RColumnDescriptor::fBitsOnStorage = 0

private

The size in bits of elements of this column.

Most columns have the size fixed by their type but low-precision float columns have variable bit widths.

Definition at line 188 of file RNTupleDescriptor.hxx.

fFieldId

ROOT::DescriptorId_t ROOT::Experimental::RColumnDescriptor::fFieldId = ROOT::kInvalidDescriptorId

private

Every column belongs to one and only one field.

Definition at line 176 of file RNTupleDescriptor.hxx.

fFirstElementIndex

std::int64_t ROOT::Experimental::RColumnDescriptor::fFirstElementIndex = 0U

private

The absolute value specifies the index for the first stored element for this column.

For deferred columns the absolute value is larger than zero. Negative values specify a suppressed and deferred column.

Definition at line 180 of file RNTupleDescriptor.hxx.

fIndex

std::uint32_t ROOT::Experimental::RColumnDescriptor::fIndex = 0

private

A field can be serialized into several columns, which are numbered from zero to $n$.

Definition at line 182 of file RNTupleDescriptor.hxx.

fLogicalColumnId

ROOT::DescriptorId_t ROOT::Experimental::RColumnDescriptor::fLogicalColumnId = ROOT::kInvalidDescriptorId

private

The actual column identifier, which is the link to the corresponding field.

Definition at line 172 of file RNTupleDescriptor.hxx.

fPhysicalColumnId

ROOT::DescriptorId_t ROOT::Experimental::RColumnDescriptor::fPhysicalColumnId = ROOT::kInvalidDescriptorId

private

Usually identical to the logical column ID, except for alias columns where it references the shadowed column.

Definition at line 174 of file RNTupleDescriptor.hxx.

fRepresentationIndex

std::uint16_t ROOT::Experimental::RColumnDescriptor::fRepresentationIndex = 0

private

A field may use multiple column representations, which are numbered from zero to $m$.

Every representation has the same number of columns.

Definition at line 185 of file RNTupleDescriptor.hxx.

fType

ROOT::ENTupleColumnType ROOT::Experimental::RColumnDescriptor::fType = ROOT::ENTupleColumnType::kUnknown

private

The on-disk column type.

Definition at line 190 of file RNTupleDescriptor.hxx.

fValueRange

std::optional<RValueRange> ROOT::Experimental::RColumnDescriptor::fValueRange

private

Optional value range (used e.g. by quantized real fields)

Definition at line 192 of file RNTupleDescriptor.hxx.

Libraries for ROOT::Experimental::RColumnDescriptor:

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

• tree/ntuple/v7/inc/ROOT/RNTupleDescriptor.hxx
• tree/ntuple/v7/src/RNTupleDescriptor.cxx