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ROS is a framework that is implemented in several languages such as C++, Python and Lisp. There are experimental libraries for Java and Lua among others as well (source)

ROS messages are defined using a simple description language .

To use these messages in a ROS implementation (such as the C++ implementation roscpp), these messages need to be converted into a language specific data structure (C++ class / struct). With generate_message, system will build language specific files (for roscpp, it creates .h header files for each message, which is why when we define a custom_msg.msg, to use it with roscpp we #inclde <custom_msg.h>).

To support multiple languages, the simple description language restricts field names to start with an alphabetic character followed by alphanumeric and underscore characters ( i.e. [a-zA-Z][a-zA-Z1-9_]*]). Using keywords in common languages is discouraged to avoid confusion, however they are legal.

Currently, C++, Python and Lisp are among the supported languages. The corresponding target names are bar_gencpp, bar_genpy and bar_genlisp. for project bar that contains the dependent messages.

ROS is a framework that is implemented in several languages such as C++, Python and Lisp. There are experimental libraries for Java and Lua among others as well (source)

ROS messages are defined using a simple description language .

To use these messages in a ROS implementation (such as the C++ implementation roscpp), these messages need to be converted into a language specific data structure (C++ class / struct). With generate_message, system will build language specific files (for roscpp, it creates .h header files for each message, which is why when we define a custom_msg.msg, to use it with roscpp we #inclde <custom_msg.h>).

To support multiple languages, the simple description language restricts field names to start with an alphabetic character followed by alphanumeric and underscore characters ( i.e. [a-zA-Z][a-zA-Z1-9_]*]). Using keywords in common languages is discouraged to avoid confusion, however they are legal.

Currently, C++, Python and Lisp are among the supported languages. The corresponding target names are bar_gencpp, bar_genpy and bar_genlisp. for project bar that contains the dependent messages.