ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT > Class Template Reference

template<typename CppT, typename NarrowT>
class ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT >

Base class for delta + split columns (index columns) whose on-storage representation is little-endian.

The implementation of Pack and Unpack takes care of splitting and, if necessary, byteswap. As part of the encoding, can also narrow down the type to NarrowT.

Definition at line 386 of file RColumnElement.hxx.

Public Member Functions
void	Pack (void *dst, void *src, std::size_t count) const final
	If the on-storage layout and the in-memory layout differ, packing creates an on-disk page from an in-memory page.
void	Unpack (void *dst, void *src, std::size_t count) const final
	If the on-storage layout and the in-memory layout differ, unpacking creates a memory page from an on-storage page.
Public Member Functions inherited from ROOT::Experimental::Internal::RColumnElementBase
	RColumnElementBase (const RColumnElementBase &other)=default
	RColumnElementBase (RColumnElementBase &&other)=default
virtual	~RColumnElementBase ()=default
std::size_t	GetBitsOnStorage () const
std::size_t	GetPackedSize (std::size_t nElements=1U) const
std::size_t	GetSize () const
virtual bool	IsMappable () const
	Derived, typed classes tell whether the on-storage layout is bitwise identical to the memory layout.
RColumnElementBase &	operator= (const RColumnElementBase &other)=delete
RColumnElementBase &	operator= (RColumnElementBase &&other)=default

Static Public Attributes
static constexpr bool	kIsMappable = false

Protected Member Functions
	RColumnElementDeltaSplitLE (std::size_t size, std::size_t bitsOnStorage)
Protected Member Functions inherited from ROOT::Experimental::Internal::RColumnElementBase
	RColumnElementBase (std::size_t size, std::size_t bitsOnStorage=0)

Additional Inherited Members
Static Public Member Functions inherited from ROOT::Experimental::Internal::RColumnElementBase
template<typename CppT = void>
static std::unique_ptr< RColumnElementBase >	Generate (EColumnType type)
	If CppT == void, use the default C++ type for the given column type.
template<>
std::unique_ptr< RColumnElementBase >	Generate (EColumnType type)
template<>
std::unique_ptr< ROOT::Experimental::Internal::RColumnElementBase >	Generate (EColumnType type)
static std::size_t	GetBitsOnStorage (EColumnType type)
static std::string	GetTypeName (EColumnType type)
Protected Attributes inherited from ROOT::Experimental::Internal::RColumnElementBase
std::size_t	fBitsOnStorage
std::size_t	fSize
	Size of the C++ value that corresponds to the on-disk element.

#include <ROOT/RColumnElement.hxx>

Inheritance diagram for ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT >:

Constructor & Destructor Documentation

RColumnElementDeltaSplitLE()

template<typename CppT , typename NarrowT >

ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT >::RColumnElementDeltaSplitLE ( std::size_t  size, std::size_t  bitsOnStorage  )

inlineexplicitprotected

Definition at line 388 of file RColumnElement.hxx.

Member Function Documentation

Pack()

template<typename CppT , typename NarrowT >

void ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT >::Pack ( void *  destination, void *  source, std::size_t  count  ) const

inlinefinalvirtual

If the on-storage layout and the in-memory layout differ, packing creates an on-disk page from an in-memory page.

Reimplemented from ROOT::Experimental::Internal::RColumnElementBase.

Definition at line 396 of file RColumnElement.hxx.

Unpack()

template<typename CppT , typename NarrowT >

void ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT >::Unpack ( void *  destination, void *  source, std::size_t  count  ) const

inlinefinalvirtual

If the on-storage layout and the in-memory layout differ, unpacking creates a memory page from an on-storage page.

Reimplemented from ROOT::Experimental::Internal::RColumnElementBase.

Definition at line 400 of file RColumnElement.hxx.

Member Data Documentation

kIsMappable

template<typename CppT , typename NarrowT >

constexpr bool ROOT::Experimental::Internal::RColumnElementDeltaSplitLE< CppT, NarrowT >::kIsMappable = false

staticconstexpr

Definition at line 394 of file RColumnElement.hxx.