Minimal subscriber cookbook recipes

This package contains a few different strategies for creating nodes which receive messages: * lambda.cpp uses a C++11 lambda function * member_function.cpp uses a C++ member function callback * not_composable.cpp uses a global function callback without a Node subclass

Note that not_composable.cpp instantiates a rclcpp::Node without subclassing it. This was the typical usage model in ROS 1, but this style of coding is not compatible with composing multiple nodes into a single process. Thus, it is no longer the recommended style for ROS 2.

All of these nodes do the same thing: they create a node called minimal_listener and subscribe to a topic named topic which is of datatype std_msgs/String. When a message arrives on that topic, the node prints it to the screen. We provide multiple examples of different coding styles which achieve this behavior in order to demonstrate that there are many ways to do this in ROS 2.

Changelog for package examples_rclcpp_minimal_subscriber

0.6.3 (2019-03-09)

0.6.2 (2019-02-08)

• Updated documentation. (#225)
• Contributors: Dirk Thomas

0.6.0 (2018-11-20)

• Added semicolons to all RCLCPP and RCUTILS macros. (#214)
• Contributors: Chris Lalancette

0.5.1 (2018-06-27)

• make Mikael Arguedas the maintainer (#212)
• Contributors: Mikael Arguedas

0.5.0 (2018-06-26)

• Change the not_composable example to destroy subscription first. (#210)
• Contributors: Chris Lalancette

0.4.0 (2017-12-08)

• use global node not local (#195)
• Use logging (#190)
• 0.0.3
• call shutdown before exiting (#179)
• 0.0.2
• rename executables with shorter names (#177)
• install executables in package specific path #173
• use CMAKE_X_STANDARD and check compiler rather than platform
• add pedantic flag
• Cpp14 (#147)
• Minimal service and client (#138)
• Add examples_ prefix to package names to avoid future collisions. (#137)
• attempt to improve indentation which includes a c++11 lambda
• fix cmake indentation and c++11 flag ordering
• change talker/listener to minimal_publisher/minimal_subscriber
• Contributors: Dirk Thomas, Mikael Arguedas, Morgan Quigley