[SciPy-dev] How to use weave.ext_function() ?

Matthieu Brucher matthieu.brucher@gmail....
Wed Oct 10 16:07:58 CDT 2007


Hi again,

I'm trying to put together a simple sample for the use of weave.ext_function.
I was first amazed by the lack of the support_code argument, one has to go
through customize.

Here is the code I want to use :

#!/usr/bin/python

import scipy.weave

support_code="""
#include <numeric>

template<class Array>
float somme(const Array& array)
{
  return std::accumulate(array.begin(), array.end(), ++array);
}
"""

code="""
  return_val=somme(a)
"""

module = scipy.weave.ext_module("weave_ext_module")
fonction = scipy.weave.ext_function("somme", code, ['a'], type_converters=
scipy.weave.converters.blitz)
fonction.customize.add_support_code(support_code)
module.add_function(fonction)
module.compile()

import weave_ext_module
print dir(weave_ext_module)

import numpy
a = numpy.array(((1., 2., 3.), (4., 5., 6.)))
print weave_ext_module(a)
print weave_ext_module(a=a)

When it tries to compile the code, I have a KeyError in ext_tools line 421
for the variable a.

I didn't have a problem with inline or blitz, so why this error occurs there
?

Matthieu
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