This is an example of an external feature function which is loaded as a dynamically linked library at run time to compute feature functions over derivations in a hypergraph. To load feature external feature functions, you can specify them in your cdec.ini configuration file as follows:

feature_function=External /path/to/libmy_feature.so

Any extra options are passed to the external library.

Note: the build system uses GNU Libtool to create the shared library. This may be placed in a hidden directory called ./libs.