TYPEMAP
Arcus_API *      T_ARCUS_API

INPUT
T_ARCUS_API
  IV tmp = SvIV((SV *) SvRV($arg));
  $var = INT2PTR(Arcus_API *, tmp);

OUTPUT
T_ARCUS_API
  sv_setref_pv($arg, class, (void*) $var);
