[C++-sig] function with >15 args yields get_signature error

Eilif Mueller eilif at gmx.de
Mon Oct 26 21:59:13 CET 2009


Hi,

Thanks!  -DBOOST_PYTHON_MAX_ARITY=34 did indeed help ... for simple functions it did the trick, and it did increase my limit for member functions, but only to 25.  For over 25 args for a member functions of an exposed class I get the following compiler error:

/usr/include/boost/python/detail/invoke.hpp:81: error: must use ‘.*’ or ‘->*’ to call pointer-to-member function in ‘f (...)’


#include <boost/python.hpp>

using namespace boost::python;

class MyClass {

public:

  int qq(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, int x17, int x18, int x19, int x20,
	 int x21, int x22, int x23, int x24, float x25 /*,float x26*/);

};

BOOST_PYTHON_MODULE(mytest) 
{

class_< MyClass >("MyClass", init<>() )
  .def("qq",&MyClass::qq);

}

Any ideas?  

cheers,

Eilif



-------- Original-Nachricht --------
> Datum: Mon, 26 Oct 2009 12:20:14 -0500
> Von: William Ladwig <wladwig at wdtinc.com>
> An: Development of Python/C++ integration <cplusplus-sig at python.org>
> Betreff: Re: [C++-sig] function with >15 args yields get_signature error

> There is a config macro BOOST_PYTHON_MAX_ARITY which may work for you. 
> I'm not sure how high you can increase this number though.  Refer to:
> 
> http://www.boost.org/doc/libs/1_40_0/libs/python/doc/v2/configuration.html
> 
> 
> 
> -----Original Message-----
> From: cplusplus-sig-bounces+wladwig=wdtinc.com at python.org
> [mailto:cplusplus-sig-bounces+wladwig=wdtinc.com at python.org] On Behalf Of Eilif Mueller
> Sent: Monday, October 26, 2009 12:02 PM
> To: cplusplus-sig at python.org
> Subject: [C++-sig] function with >15 args yields get_signature error
> 
> 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 boost::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 boost::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, int, 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 'get_signature(int (*&)(int, int, int, int, int, int, int,
> int, int, int, int, int, int, int, 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 gcc-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.
> 
> cheers,
> 
> Eilif
> 
> 
> 
> 
> 
>  
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