The pre-releases 17-01/14 and higher come with a C++ interface originally written by Valerio Bertone.
The wrapper source code can be found in the CxxWrap and the header files in the CxxHead directories of the qcdnum distrubution. The C++ test jobs can be run straight out-of-the-box from the run directory, for instance:
run> ./runtest exampleCxx
At present, the interface is fully tested for the QCDNUM out-of-the-box routines and for the structure function packages ZMSTF and HQSTF. The toolbox wrappers will be made available at a future release.
Please note that the datacard steering of QCDNUM does presently not work in C++.
If you have any questions or remarks about the interface, please send an email to Michiel Botje.