The online documentation includes only the Python API, but not the C++ API provided in/exported from https://gitlab.idiap.ch/bob/bob.ip.base/tree/master/bob/ip/base/include/bob.ip.base

Also, the first sentence in the online documentation This Python module contains base functionality from Bob bound to Python, available in the C++ counter-part bob::ip::base. does not make sense since this package contains both the C++ and the Python functionality.