Example.cc

#include <boost/python.hpp>

char const * greet() {
        return "hello, world";
}

struct World {
        void set(std::string msg) { this->msg = msg; }
        std::string greet() { return msg; }
        std::string msg;
};

BOOST_PYTHON_MODULE(example) {
        using namespace boost::python;
        
        def("greet", greet);
        
        class_<World>("World")
                .def("greet", &World::greet)
                .def("set", &World::set)
        ;
}