SWIG typemap to pass complex arrays into C++

[Andrew Gregory]

In a C++ header file (Borland BCC5.5) I have written

#include <complex.h>
typedef complex<double> dcomplex;

// Function to return i'th element of complex array
double getel (dcomplex *A, int i)
{ return real(A[i]); };


The function getel is illustrative only - not part of a real problem.

I have written a SWIG typemap to allow complex number arrays to be
passed:

%typemap(python,in) dcomplex *
{
  if (!PyList_Check($input))
        {
          PyErr_SetString(PyExc_TypeError, "expected a list");
          return NULL;
        };

  int arrsize = PyList_Size($input);

  $1 = (dcomplex *)malloc(sizeof(dcomplex)*(arrsize+1));
  for (int i=0; i<arrsize; i++)
  {
     PyObject *item = PyList_GetItem($input, i);
     if (PyComplex_Check(item))
           $1[i] = dcomplex(PyComplex_RealAsDouble(item),
                                PyComplex_ImagAsDouble(item));
     else
     {
       free ((dcomplex *) $input);
       PyErr_SetString(PyExc_TypeError, "expected complex numbers in
list");
       return NULL;
     };

  }

}

%typemap (python,freearg) dcomplex *
{
   free ((dcomplex *) $input);
};

SWIG (1.3.11u) runs ok. BCC5.5 compiles the wrapper file ok. But when
I try to use the function getel from Python 2.2.1 I get the error
message:

TypeError: Type error. Expected _p_dcomplex

I hand-coded my own wrapper and that worked, but can't make the
typemap work. Any suggestions?

Andrew.