tuple_converter.cpp

template<typename... Args>
struct TupleConverter
{
    typedef boost::python::list PyTuple;

    static void* convertible(PyObject* obj)
    {
        boost::python::extract<PyTuple> tupleExtract(obj);
        if (!tupleExtract.check()) return nullptr;

        PyTuple tuple = tupleExtract();
        if (boost::python::len(tuple) != sizeof...(Args)) return nullptr;

        if (!check<0, Args...>(tuple))
            return nullptr;
        return obj;
    }

    template<size_t Index, typename Arg, typename... Rest>
    static bool check(PyTuple tuple)
    {
        boost::python::extract<Arg> extract(tuple[Index]);
        if (!extract.check()) {
            return false;
        }

        return check<Index+1, Rest...>(tuple);
    }

    template<size_t Index>
    static bool check(PyTuple tuple)
    {
        return true;
    }
};