template<typename CppT, EColumnType ColumnT>
class ROOT::Experimental::Detail::RColumnElement< CppT, ColumnT >

Pairs of C++ type and column type, like float and EColumnType::kReal32.

A column element points either to the content of an RFieldValue or into a memory mapped page.

The content pointed to by fRawContent can be a single element or the first element of an array. Usually the on-disk element should map bitwise to the in-memory element. Sometimes that's not the case though, for instance on big endian platforms and for exotic physical columns like 8 bit float.

This class does not provide protection around the raw pointer, fRawContent has to be managed correctly by the user of this class.

Definition at line 107 of file RColumnElement.hxx.

Public Member Functions
	RColumnElement (CppT *value)

Public Member Functions inherited from ROOT::Experimental::Detail::RColumnElementBase
	RColumnElementBase ()

	RColumnElementBase (const RColumnElementBase &elemArray, std::size_t at)

	RColumnElementBase (const RColumnElementBase &other)=default

	RColumnElementBase (RColumnElementBase &&other)=default

	RColumnElementBase (void *rawContent, std::size_t size)

virtual	~RColumnElementBase ()=default

virtual std::size_t	GetBitsOnStorage () const

void *	GetRawContent () 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. More...

RColumnElementBase &	operator= (const RColumnElementBase &other)=delete

RColumnElementBase &	operator= (RColumnElementBase &&other)=default

virtual void	Pack (void destination, void source, std::size_t count) const
	If the on-storage layout and the in-memory layout differ, packing creates an on-disk page from an in-memory page. More...

void	ReadFrom (void *source, std::size_t count)
	Set the column element or an array of elements from the memory location source. More...

virtual void	Unpack (void destination, void source, std::size_t count) const
	If the on-storage layout and the in-memory layout differ, unpacking creates a memory page from an on-storage page. More...

void	WriteTo (void *destination, std::size_t count) const
	Write one or multiple column elements into destination. More...

Additional Inherited Members
Static Public Member Functions inherited from ROOT::Experimental::Detail::RColumnElementBase
static RColumnElementBase	Generate (EColumnType type)

Protected Attributes inherited from ROOT::Experimental::Detail::RColumnElementBase
void *	fRawContent
	Points to valid C++ data, either a single value or an array of values. More...

std::size_t	fSize
	Size of the C++ value pointed to by fRawContent (not necessarily equal to the on-disk element size) More...

#include <ROOT/RColumnElement.hxx>

Inheritance diagram for ROOT::Experimental::Detail::RColumnElement< CppT, ColumnT >:

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Constructor & Destructor Documentation

◆ RColumnElement()

template<typename CppT , EColumnType ColumnT>

ROOT::Experimental::Detail::RColumnElement< CppT, ColumnT >::RColumnElement ( CppT * value )

inlineexplicit

Definition at line 109 of file RColumnElement.hxx.

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

tree/ntuple/v7/inc/ROOT/RColumnElement.hxx

Public Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ RColumnElement()