Libchewingpp is a project mainly written in C++ and C, it's free.
libchewing c++ wrapper
This library provide C++ wrapper to jserv's libchewing (http://jserv.sayya.org/wiki/index.php/Qooing).
Chewingpp.h - Object prototype Chewing.cpp - Object implementation
In order to build this library, you'll need to install libchewing first. After that, you may try
make make test
to see if it works.
Cheers Kang-min "Gugod" Liu