overwrite_buffer Class

Article
07/10/2012

An overwrite_buffer messaging block is a multi-target, multi-source, ordered propagator_block capable of storing a single message at a time. New messages overwrite previously held ones.

template<
   class _Type
>
class overwrite_buffer : public propagator_block<multi_link_registry<ITarget<_Type>>, multi_link_registry<ISource<_Type>>>;

Parameters

_Type
The payload type of the messages stored and propagated by the buffer.

Members

Public Constructors

Name	Description
overwrite_buffer::overwrite_buffer Constructor	Overloaded. Constructs an overwrite_buffer messaging block.
overwrite_buffer::~overwrite_buffer Destructor	Destroys the overwrite_buffer messaging block.

Public Methods

Name	Description
overwrite_buffer::has_value Method	Checks whether this overwrite_buffer messaging block has a value yet.
overwrite_buffer::value Method	Gets a reference to the current payload of the message being stored in the overwrite_buffer messaging block.

Protected Methods

Name	Description
overwrite_buffer::accept_message Method	Accepts a message that was offered by this overwrite_buffer messaging block, returning a copy of the message to the caller.
overwrite_buffer::consume_message Method	Consumes a message previously offered by the overwrite_buffer messaging block and reserved by the target, returning a copy of the message to the caller.
overwrite_buffer::link_target_notification Method	A callback that notifies that a new target has been linked to this overwrite_buffer messaging block.
overwrite_buffer::propagate_message Method	Asynchronously passes a message from an ISource block to this overwrite_buffer messaging block. It is invoked by the propagate method, when called by a source block.
overwrite_buffer::propagate_to_any_targets Method	Places the message_PMessage in this overwrite_buffer messaging block and offers it to all of the linked targets.
overwrite_buffer::release_message Method	Releases a previous message reservation. (Overrides source_block::release_message.)
overwrite_buffer::reserve_message Method	Reserves a message previously offered by this overwrite_buffer messaging block. (Overrides source_block::reserve_message.)
overwrite_buffer::resume_propagation Method	Resumes propagation after a reservation has been released. (Overrides source_block::resume_propagation.)
overwrite_buffer::send_message Method	Synchronously passes a message from an ISource block to this overwrite_buffer messaging block. It is invoked by the send method, when called by a source block.
overwrite_buffer::supports_anonymous_source Method	Overrides the supports_anonymous_source method to indicate that this block can accept messages offered to it by a source that is not linked. (Overrides ITarget::supports_anonymous_source.)