Interface of processor for a record. More...

#include <tkrzw_dbm.h>

Public Member Functions
virtual	~RecordProcessor ()=default
	Destructor. More...

virtual std::string_view	ProcessFull (std::string_view key, std::string_view value)
	Processes an existing record. More...

virtual std::string_view	ProcessEmpty (std::string_view key)
	Processes an empty record space. More...

Static Public Attributes
static const std::string_view	NOOP
	The special string indicating no operation. More...

static const std::string_view	REMOVE
	The special string indicating removing operation. More...

Detailed Description

Interface of processor for a record.

Constructor & Destructor Documentation

◆ ~RecordProcessor()

virtual tkrzw::DBM::RecordProcessor::~RecordProcessor ( )

virtualdefault

Destructor.

Reimplemented in tkrzw::AsyncDBM::RecordProcessor.

Member Function Documentation

◆ ProcessFull()

virtual std::string_view tkrzw::DBM::RecordProcessor::ProcessFull	(	std::string_view	key,
		std::string_view	value
	)

virtual

Processes an existing record.

Parameters

key	The key of the existing record.
value	The value of the existing record.

Returns: A string reference to NOOP, REMOVE, or a string of a new value.

The memory referred to by the return value must be alive until the end of the life-span of this object or until this function is called next time.

◆ ProcessEmpty()

virtual std::string_view tkrzw::DBM::RecordProcessor::ProcessEmpty ( std::string_view key )

virtual

Processes an empty record space.

Parameters

key	The key specified by the caller.

Returns: A string reference to NOOP, REMOVE, or the new value.

The memory referred to by the return value must be alive until the end of the life-span of this object or until this function is called next time.

Reimplemented in tkrzw::DBM::RecordSetterRekey, tkrzw::DBM::RecordRemoverRekey, tkrzw::DBM::RecordCheckerRekey, tkrzw::DBM::RecordSetterCompareExchangeMulti, tkrzw::DBM::RecordCheckerCompareExchangeMulti, tkrzw::DBM::RecordProcessorIncrement, tkrzw::DBM::RecordProcessorCompareExchange, tkrzw::DBM::RecordProcessorAppend, tkrzw::DBM::RecordProcessorRemove, tkrzw::DBM::RecordProcessorSet, tkrzw::DBM::RecordProcessorGet, and tkrzw::DBM::RecordProcessorLambda.

Member Data Documentation

◆ NOOP

const std::string_view tkrzw::DBM::RecordProcessor::NOOP

static

The special string indicating no operation.

The uniqueness comes from the address of the data region. So, checking should be done like your_value.data() == NOOP.data().

◆ REMOVE

const std::string_view tkrzw::DBM::RecordProcessor::REMOVE