Eilif Mueller wrote:
>  Hi,
>  
>  Wrapping a function f with 16 arguments:
>  
>  int f(int x1, int x2, int x3, int x4, int x5,
>        int x6, int x7, int x8, int x9, int x10,
>        int x11, int x12, int x13, int x14, int x15,
>        int x16) {
>  
>    return x1;
>  
>  }
>  
>  BOOST_PYTHON_MODULE(test)
>  {
>  
>    def("f",f);
>  
>  }
>  
>  
>  yields
>  
>  /usr/include/boost/python/make_function.hpp: In function ‘boost::python::api::object boo
st::python::make_function(F) [with F = int (*)(int, int, int, int, int, int, int, int, int, 
int, int, int, int, int, int, int)]’:
>  /usr/include/boost/python/def.hpp:82:   instantiated from ‘boost::python::api::object bo
ost::python::detail::make_function1(T, ...) [with T = int (*)(int, int, int, int, int, int, 
int, int, int, int, int, int, int, int, int, int)]’
>  /usr/include/boost/python/def.hpp:91:   instantiated from ‘void boost::python::def(const
 char*, Fn) [with Fn = int (*)(int, int, int, int, int, int, int, int, int, int, int, int, i
nt, int, int, int)]’
>  test_module.cpp:20:   instantiated from here
>  /usr/include/boost/python/make_function.hpp:104: error: no matching function for call to â
€˜get_signature(int (*&)(int, int, int, int, int, int, int, int, int, int, int, int, int, in
t, int, int))’
>  make: *** [stream.o] Error 1
>  
>  
>  whereas all is fine if that last arg "int x16" is removed.  All of gcc-4.2, gcc-4.3 and gc
c-4.4 seem to exhibit the same behaviour.  Same effect for libboost-python1.38-dev on Ubuntu
 karmic and libboost-python1.35-dev on Ubuntu jaunty.
>  
>  I need that 16th arg and more ... about 32 args, I think.
>  
>  Thanks for any help you can offer.
>  

This came up recently.  You're going to have various problems (not all 
boost.python problems) getting arity that large.  The workaround is to 
introduce an intermediate function that takes a boost::python::tuple
and forward to the zillion-arguments one, example here:
 
http://gitorious.org/~straszheim/boost/straszheim/blobs/python/libs/python/test/zillion_argu
ments_workaround.cpp

-t

_______________________________________________
Cplusplus-sig mailing list
Cplusplus-sig@[...].org
http://mail.python.org/mailman/listinfo/cplusplus-sig