Definition at line 21 of file RTrivialDS.hxx.

Public Member Functions
	RTrivialDS (ULong64_t size, bool skipEvenEntries=false)

	~RTrivialDS ()

const std::vector< std::string > &	GetColumnNames () const
	Returns a reference to the collection of the dataset's column names. More...

std::vector< std::pair< ULong64_t, ULong64_t > >	GetEntryRanges ()
	Return ranges of entries to distribute to tasks. More...

std::string	GetTypeName (std::string_view) const
	Type of a column as a string, e.g. More...

bool	HasColumn (std::string_view colName) const
	Checks if the dataset has a certain column. More...

void	Initialise ()
	Convenience method called before starting an event-loop. More...

bool	SetEntry (unsigned int slot, ULong64_t entry)
	Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot. More...

void	SetNSlots (unsigned int nSlots)
	Inform RDataSource of the number of processing slots (i.e. More...

Public Member Functions inherited from ROOT::RDF::RDataSource
virtual	~RDataSource ()=default

virtual void	Finalise ()
	Convenience method called after concluding an event-loop. More...

virtual void	FinaliseSlot (unsigned int)
	Convenience method called at the end of the data processing associated to a slot. More...

template<typename T >
std::vector< T ** >	GetColumnReaders (std::string_view columnName)
	Called at most once per column by RDF. More...

virtual void	InitSlot (unsigned int, ULong64_t)
	Convenience method called at the start of the data processing associated to a slot. More...

Private Member Functions
std::vector< void * >	GetColumnReadersImpl (std::string_view name, const std::type_info &)
	type-erased vector of pointers to pointers to column values - one per slot More...

Private Attributes
std::vector< std::string >	fColNames {"col0"}

std::vector< ULong64_t >	fCounter

std::vector< ULong64_t * >	fCounterAddr

std::vector< std::pair< ULong64_t, ULong64_t > >	fEntryRanges

unsigned int	fNSlots = 0U

ULong64_t	fSize = 0ULL

bool	fSkipEvenEntries = false

Additional Inherited Members
Protected Types inherited from ROOT::RDF::RDataSource
using	Record_t = std::vector< void * >

#include <ROOT/RTrivialDS.hxx>

Inheritance diagram for ROOT::RDF::RTrivialDS:

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Constructor & Destructor Documentation

◆ RTrivialDS()

ROOT::RDF::RTrivialDS::RTrivialDS	(	ULong64_t	size,
		bool	skipEvenEntries = `false`
	)

Definition at line 24 of file RTrivialDS.cxx.

◆ ~RTrivialDS()

ROOT::RDF::RTrivialDS::~RTrivialDS ( )

Definition at line 28 of file RTrivialDS.cxx.

Member Function Documentation

◆ GetColumnNames()

const std::vector< std::string > & ROOT::RDF::RTrivialDS::GetColumnNames ( ) const

virtual

Returns a reference to the collection of the dataset's column names.

Implements ROOT::RDF::RDataSource.

Definition at line 32 of file RTrivialDS.cxx.

◆ GetColumnReadersImpl()

std::vector< void * > ROOT::RDF::RTrivialDS::GetColumnReadersImpl	(	std::string_view	name,
		const std::type_info &
	)

privatevirtual

type-erased vector of pointers to pointers to column values - one per slot

Implements ROOT::RDF::RDataSource.

Definition at line 10 of file RTrivialDS.cxx.

◆ GetEntryRanges()

std::vector< std::pair< ULong64_t, ULong64_t > > ROOT::RDF::RTrivialDS::GetEntryRanges ( )

virtual

Return ranges of entries to distribute to tasks.

They are required to be contiguous intervals with no entries skipped. Supposing a dataset with nEntries, the intervals must start at 0 and end at nEntries, e.g. [0-5],[5-10] for 10 entries.

Implements ROOT::RDF::RDataSource.

Definition at line 47 of file RTrivialDS.cxx.

◆ GetTypeName()

std::string ROOT::RDF::RTrivialDS::GetTypeName ( std::string_view ) const

virtual

Type of a column as a string, e.g.

GetTypeName("x") == "double". Required for jitting e.g. df.Filter("x>0").

Parameters

[in] columnName The name of the column

Implements ROOT::RDF::RDataSource.

Definition at line 42 of file RTrivialDS.cxx.

◆ HasColumn()

bool ROOT::RDF::RTrivialDS::HasColumn ( std::string_view ) const

virtual

Checks if the dataset has a certain column.

Parameters

[in] columnName The name of the column

Implements ROOT::RDF::RDataSource.

Definition at line 37 of file RTrivialDS.cxx.

◆ Initialise()

void ROOT::RDF::RTrivialDS::Initialise ( )

virtual

Convenience method called before starting an event-loop.

This method might be called multiple times over the lifetime of a RDataSource, since users can run multiple event-loops with the same RDataFrame. Ideally, Initialise should set the state of the RDataSource so that multiple identical event-loops will produce identical results.

Reimplemented from ROOT::RDF::RDataSource.

Definition at line 71 of file RTrivialDS.cxx.

◆ SetEntry()

bool ROOT::RDF::RTrivialDS::SetEntry	(	unsigned int	slot,
		ULong64_t	entry
	)

virtual

Advance the "cursors" returned by GetColumnReaders to the selected entry for a particular slot.

Parameters

[in]	slot	The data processing slot that needs to be considered
[in]	entry	The entry which needs to be pointed to by the reader pointers Slots are adopted to accommodate parallel data processing. Different workers will loop over different ranges and will be labelled by different "slot" values. Returns true if the entry has to be processed, false otherwise.

Implements ROOT::RDF::RDataSource.

Definition at line 53 of file RTrivialDS.cxx.

◆ SetNSlots()

void ROOT::RDF::RTrivialDS::SetNSlots ( unsigned int nSlots )

virtual

Inform RDataSource of the number of processing slots (i.e.

worker threads) used by the associated RDataFrame. Slots numbers are used to simplify parallel execution: RDataFrame guarantees that different threads will always pass different slot values when calling methods concurrently.

Implements ROOT::RDF::RDataSource.

Definition at line 62 of file RTrivialDS.cxx.

Member Data Documentation

◆ fColNames

std::vector<std::string> ROOT::RDF::RTrivialDS::fColNames {"col0"}

private

Definition at line 27 of file RTrivialDS.hxx.

◆ fCounter

std::vector<ULong64_t> ROOT::RDF::RTrivialDS::fCounter

private

Definition at line 28 of file RTrivialDS.hxx.

◆ fCounterAddr

std::vector<ULong64_t *> ROOT::RDF::RTrivialDS::fCounterAddr

private

Definition at line 29 of file RTrivialDS.hxx.

◆ fEntryRanges

std::vector<std::pair<ULong64_t, ULong64_t> > ROOT::RDF::RTrivialDS::fEntryRanges

private

Definition at line 26 of file RTrivialDS.hxx.

◆ fNSlots

unsigned int ROOT::RDF::RTrivialDS::fNSlots = 0U

private

Definition at line 23 of file RTrivialDS.hxx.

◆ fSize

ULong64_t ROOT::RDF::RTrivialDS::fSize = 0ULL

private

Definition at line 24 of file RTrivialDS.hxx.

◆ fSkipEvenEntries

bool ROOT::RDF::RTrivialDS::fSkipEvenEntries = false

private

Definition at line 25 of file RTrivialDS.hxx.

Libraries for ROOT::RDF::RTrivialDS:

[legend]

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RTrivialDS()

◆ ~RTrivialDS()

Member Function Documentation

◆ GetColumnNames()

◆ GetColumnReadersImpl()

◆ GetEntryRanges()

◆ GetTypeName()

◆ HasColumn()

◆ Initialise()

◆ SetEntry()

◆ SetNSlots()

Member Data Documentation

◆ fColNames

◆ fCounter

◆ fCounterAddr

◆ fEntryRanges

◆ fNSlots

◆ fSize

◆ fSkipEvenEntries