cdef extern from "cppwrap_lib.cpp":

    pass

cdef extern from "cppwrap_lib.h":

    void voidfunc()

    double doublefunc(double a, double b, double c)

    cdef cppclass DoubleKeeper:

        DoubleKeeper(double factor)

        void set_number(double f)

        double get_number()

        double transmogrify(double value)

    double transmogrify_from_cpp (DoubleKeeper *obj, double value)