"Neal D. Becker" <nbecker@[...].com>  writes:

>  How to I interface algorithms with STL style iterator interface to python?
> 
> 
>  For example:
> 
>  typedef std::complex<double> Complex;
>  //expose std::vector<Complex> to python:
> 
>  //also let's pick a simple example function:
> 
>  inline Complex Sum (const std::vector<Complex>::iterator& beg, const std::vector<Complex>:
:iterator& end) {
>    Complex sum = 0;
>    return std::accumulate (beg, end, sum);
>  }
> 
>  BOOST_PYTHON_MODULE(Test)
>  {    
>      class_<std::vector<std::complex<double> > >("CVec")
>        .def(init<size_t>())
>        .def(vector_indexing_suite<std::vector<std::complex<double> >, true >())
>      ;
> 
>      def ("accumulate", Sum);
>  }
> 
>  Actually 2 questions:
> 
>  1) How do I call accumulate from python?

Depends what you want to pass to it.  In other words, how would you
*like* to call accumulate from Python?  ;-)

>  2) (really a c++ question) How can I avoid introducing the "Sum" function?  If I put
> 
>  def ("accumulate", std::accumulate<const std::vector<Complex>::iterator&,  Complex>)
> 
>  I get
>  Test.cc:115: error: no matching function for call to `def(const char[11], 
>     <unknown type>)'

That's a compiler bug probably, but nonetheless you're not allowed to
take the address of a function in the standard library, so answer:
"you can't"

>  Problem is it's overloaded, I guess, but I don't know what to do.

Between the allowed overloading and extra default arguments,
forwarding is the only way.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com


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