The abstract base class for all signal processing blocks.Basic blocks are the bare abstraction of an entity that has a name, a set of inputs and outputs, and a message queue. These are never instantiated directly; rather, this is the abstract parent class of both gr_hier_block, which is a recursive container, and gr_block, which implements actual signal processing functions. More...

#include <gr_basic_block.h>

Inheritance diagram for gr_basic_block:

[legend]

List of all members.

Public Member Functions
virtual	~gr_basic_block ()
long	unique_id () const
std::string	name () const
gr_io_signature_sptr	input_signature () const
gr_io_signature_sptr	output_signature () const
gr_basic_block_sptr	to_basic_block ()
virtual bool	check_topology (int ninputs, int noutputs)
	Confirm that ninputs and noutputs is an acceptable combination.
template<typename T >
void	set_msg_handler (T msg_handler)
	Set the callback that is fired when messages are available.
Protected Types
enum	vcolor { WHITE, GREY, BLACK }
Protected Member Functions
	gr_basic_block (void)
	gr_basic_block (const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature)
	Protected constructor prevents instantiation by non-derived classes.
void	set_input_signature (gr_io_signature_sptr iosig)
	may only be called during constructor
void	set_output_signature (gr_io_signature_sptr iosig)
	may only be called during constructor
void	set_color (vcolor color)
	Allow the flowgraph to set for sorting and partitioning.
vcolor	color () const
Protected Attributes
std::string	d_name
gr_io_signature_sptr	d_input_signature
gr_io_signature_sptr	d_output_signature
long	d_unique_id
vcolor	d_color
Friends
class	gr_flowgraph
class	gr_flat_flowgraph
class	gr_tpb_thread_body

Detailed Description

The abstract base class for all signal processing blocks.

Basic blocks are the bare abstraction of an entity that has a name, a set of inputs and outputs, and a message queue. These are never instantiated directly; rather, this is the abstract parent class of both gr_hier_block, which is a recursive container, and gr_block, which implements actual signal processing functions.

Member Enumeration Documentation

enum gr_basic_block::vcolor [protected]

Enumerator:

WHITE
GREY
BLACK

Constructor & Destructor Documentation

gr_basic_block::gr_basic_block ( void ) [inline, protected]

gr_basic_block::gr_basic_block	(	const std::string &	name,
		gr_io_signature_sptr	input_signature,
		gr_io_signature_sptr	output_signature
	)		`[protected]`

Protected constructor prevents instantiation by non-derived classes.

virtual gr_basic_block::~gr_basic_block ( ) [virtual]

Member Function Documentation

virtual bool gr_basic_block::check_topology	(	int	ninputs,
		int	noutputs
	)		`[inline, virtual]`

Confirm that ninputs and noutputs is an acceptable combination.

Parameters:

ninputs	number of input streams connected
noutputs	number of output streams connected

Returns:: true if this is a valid configuration for this block.

This function is called by the runtime system whenever the topology changes. Most classes do not need to override this. This check is in addition to the constraints specified by the input and output gr_io_signatures.

Reimplemented in gr_pfb_clock_sync_ccf, gr_pfb_clock_sync_fff, gr_align_on_samplenumbers_ss, gr_copy, gr_deinterleave, gr_interleave, gr_kludge_copy, gr_test, gr_oscope_sink_f, audio_alsa_sink, audio_alsa_source, audio_jack_sink, audio_jack_source, audio_osx_source, audio_portaudio_sink, audio_portaudio_source, comedi_sink_s, and comedi_source_s.

Referenced by gr_test::set_check_topology().

vcolor gr_basic_block::color ( ) const [inline, protected]

gr_io_signature_sptr gr_basic_block::input_signature ( ) const [inline]

std::string gr_basic_block::name ( ) const [inline]

Referenced by tag_source_demo::make_eob_tag(), tag_source_demo::make_sob_tag(), and tag_source_demo::make_time_tag().

gr_io_signature_sptr gr_basic_block::output_signature ( ) const [inline]

void gr_basic_block::set_color ( vcolor color ) [inline, protected]

Allow the flowgraph to set for sorting and partitioning.

void gr_basic_block::set_input_signature ( gr_io_signature_sptr iosig ) [inline, protected]

may only be called during constructor

template<typename T >

void gr_basic_block::set_msg_handler ( T msg_handler ) [inline]

Set the callback that is fired when messages are available.

msg_handler can be any kind of function pointer or function object that has the signature:

    void msg_handler(pmt::pmt msg);

(You may want to use boost::bind to massage your callable into the correct form. See gr_nop.{h,cc} for an example that sets up a class method as the callback.)

Blocks that desire to handle messages must call this method in their constructors to register the handler that will be invoked when messages are available.

If the block inherits from gr_block, the runtime system will ensure that msg_handler is called in a thread-safe manner, such that work and msg_handler will never be called concurrently. This allows msg_handler to update state variables without having to worry about thread-safety issues with work, general_work or another invocation of msg_handler.

If the block inherits from gr_hier_block2, the runtime system will ensure that no reentrant calls are made to msg_handler.

void gr_basic_block::set_output_signature ( gr_io_signature_sptr iosig ) [inline, protected]

may only be called during constructor

gr_basic_block_sptr gr_basic_block::to_basic_block ( )

long gr_basic_block::unique_id ( ) const [inline]