The source tree for this recipe is similar to the two previous recipes:

.
├── cmake
│   ├── FindPythonModule.cmake
│   ├── FindSphinx.cmake
│   └── UseBreathe.cmake
├── CMakeLists.txt
├── docs
│   ├── code-reference
│   │   ├── classes-and-functions.rst
│   │   └── message.rst
│   ├── conf.py.in
│   ├── Doxyfile.in
│   └── index.rst
└── src
    ├── CMakeLists.txt
    ├── hello-world.cpp
    ├── Message.cpp
    └── Message.hpp

The docs subdirectory now contains both a Doxyfile.in and a conf.py.in template file, with settings for Doxygen and Sphinx, respectively. In addition, we also have a code-reference subdirectory.

The files following code-reference contain Breathe instructions, to include Doxygen-generated documentation in Sphinx:

Messaging classes
=================

Message
-------
.. doxygenclass:: Message
   :project: recipe-03
   :members:
   :protected-members:
   :private-members:

This will output the documentation for the Message class.