TailReaderPtr Class Reference

A reader that only ever reads the last N samples, subsequent calls may result in overlapping data. More...

Inheritance diagram for TailReaderPtr:

Collaboration diagram for TailReaderPtr:

Detailed Description

A reader that only ever reads the last N samples, subsequent calls may result in overlapping data.

Public Member Functions
daq::TailReaderStatusPtr	read (void *values, daq::SizeT *count) const
	Copies at maximum the next count unread samples to the values buffer. The amount actually read is returned through the count parameter. More...
daq::TailReaderStatusPtr	readWithDomain (void *values, void *domain, daq::SizeT *count) const
	Copies at maximum the next count unread samples and clock-stamps to the values and stamps buffers. The amount actually read is returned through the count parameter. More...
daq::SizeT	getHistorySize () const
	The maximum amount of samples in history to keep. More...
Public Member Functions inherited from GenericSampleReaderPtr< ITailReader >
daq::SampleType	getValueReadType () const
	Gets the sample-type the signal value samples will be converted to when read or SampleType::Invalid if read-type has not been determined yet. More...
daq::SampleType	getDomainReadType () const
	Gets the sample-type the signal domain samples will be converted to when read or SampleType::Invalid if read-type has not been determined yet. More...
void	setValueTransformFunction (const daq::FunctionPtr &transform) const
	Sets the transform function that will be called with the read value-data and currently valid Signal-Descriptor giving the user the chance add a custom post-processing step. The function should have a signature compatible with: More...
void	setDomainTransformFunction (const daq::FunctionPtr &transform) const
	Sets the transform function that will be called with the read domain-data and currently valid Signal-Descriptor giving the user the chance add a custom post-processing step. The function should have a signature compatible with: More...
daq::ReadMode	getReadMode () const
	Gets the reader's read mode which determines if the reader will also scale the read data or not. More...