rclcpp::ParameterEventsFilter Class Reference

Public Types
enum class	EventType { NEW , DELETED , CHANGED }
using	EventPair = std::pair< EventType, const rcl_interfaces::msg::Parameter * >
	Used for the listed results.

Public Member Functions
RCLCPP_PUBLIC	ParameterEventsFilter (std::shared_ptr< const rcl_interfaces::msg::ParameterEvent > event, const std::vector< std::string > &names, const std::vector< EventType > &types)
	Construct a filtered view of a parameter event. More...
RCLCPP_PUBLIC const std::vector< EventPair > &	get_events () const
	Get the result of the filter. More...

Detailed Description

Definition at line 34 of file parameter_events_filter.hpp.

Constructor & Destructor Documentation

ParameterEventsFilter()

ParameterEventsFilter::ParameterEventsFilter	(	std::shared_ptr< const rcl_interfaces::msg::ParameterEvent >	event,
		const std::vector< std::string > &	names,
		const std::vector< EventType > &	types
	)

Construct a filtered view of a parameter event.

Parameters

[in]	event	The parameter event message to filter.
[in]	names	A list of parameter names of interest.
[in]	types	A list of the types of parameter events of iterest. EventType NEW, DELETED, or CHANGED

Exceptions

std::invalid_argument

if event is NULL.

Example Usage:

If you have received a parameter event and are only interested in parameters foo and bar being added or changed but don't care about deletion.

auto res = rclcpp::ParameterEventsFilter(
  event_shared_ptr,
  {"foo", "bar"},
  {rclcpp::ParameterEventsFilter::EventType::NEW, rclcpp::ParameterEventsFilter::EventType::CHANGED});

Definition at line 25 of file parameter_events_filter.cpp.

Member Function Documentation

get_events()

const std::vector< EventPair > & ParameterEventsFilter::get_events

(

)

const

Get the result of the filter.

Returns

A std::vector<EventPair> of all matching parameter changes in this event.

Definition at line 61 of file parameter_events_filter.cpp.

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The documentation for this class was generated from the following files:

• rclcpp/include/rclcpp/parameter_events_filter.hpp
• rclcpp/src/rclcpp/parameter_events_filter.cpp