Method check

ngstd/python_ngstd.hpp:70–80

  extract( py::handle aobj ) : obj(aobj) {}

  bool check() {
      try
      {
        obj.cast<T>();
      }
      catch(const std::runtime_error &e)
      {
        return false;
      }
      return true;
  }

  T operator()() { return obj.cast<T>(); }
};