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module_header = \
"""
// blitz must be first, or you get have issues with isnan defintion.
#include <blitz/array.h>
#include "Python.h"
#include "Numeric/arrayobject.h"
// Use Exception stuff from SCXX
#include "PWOBase.h"
#include <stdio.h>
#include <math.h>
#include <complex>
static PyArrayObject* obj_to_numpy(PyObject* py_obj, char* name,
int Ndims, int numeric_type )
{
PyArrayObject* arr_obj = NULL;
// Make sure input is an array.
if (!PyArray_Check(py_obj))
throw PWException(PyExc_TypeError,
"Input array *name* must be an array.");
arr_obj = (PyArrayObject*) py_obj;
// Make sure input has correct numeric type.
if (arr_obj->descr->type_num != numeric_type)
{
// This should be more explicit:
// Put the desired and actual type in the message.
// printf("%d,%d",arr_obj->descr->type_num,numeric_type);
throw PWException(PyExc_TypeError,
"Input array *name* is the wrong numeric type.");
}
// Make sure input has correct rank (defined as number of dimensions).
// Currently, all arrays must have the same shape.
// Broadcasting is not supported.
// ...
if (arr_obj->nd != Ndims)
{
// This should be more explicit:
// Put the desired and actual dimensionality in message.
throw PWException(PyExc_TypeError,
"Input array *name* has wrong number of dimensions.");
}
// check the size of arrays. Acutally, the size of the "views" really
// needs checking -- not the arrays.
// ...
// Any need to deal with INC/DEC REFs?
Py_INCREF(py_obj);
return arr_obj;
}
// simple meta-program templates to specify python typecodes
// for each of the numeric types.
template<class T>
class py_type{public: enum {code = 100};};
class py_type<char>{public: enum {code = PyArray_CHAR};};
class py_type<unsigned char>{public: enum { code = PyArray_UBYTE};};
class py_type<short>{public: enum { code = PyArray_SHORT};};
class py_type<int>{public: enum { code = PyArray_INT};};
class py_type<long>{public: enum { code = PyArray_LONG};};
class py_type<float>{public: enum { code = PyArray_FLOAT};};
class py_type<double>{public: enum { code = PyArray_DOUBLE};};
class py_type<complex<float> >{public: enum { code = PyArray_CFLOAT};};
class py_type<complex<double> >{public: enum { code = PyArray_CDOUBLE};};
template<class T, int N>
static blitz::Array<T,N> py_to_blitz(PyObject* py_obj,char* name)
{
PyArrayObject* arr_obj = obj_to_numpy(py_obj,name,N,py_type<T>::code);
blitz::TinyVector<int,N> shape(0);
blitz::TinyVector<int,N> strides(0);
int stride_acc = 1;
//for (int i = N-1; i >=0; i--)
for (int i = 0; i < N; i++)
{
shape[i] = arr_obj->dimensions[i];
strides[i] = arr_obj->strides[i]/sizeof(T);
}
//return blitz::Array<T,N>((T*) arr_obj->data,shape,
return blitz::Array<T,N>((T*) arr_obj->data,shape,strides,
blitz::neverDeleteData);
}
template<class T>
static T py_to_scalar(PyObject* py_obj,char* name)
{
//never used.
return (T) 0;
}
template<>
static int py_to_scalar<int>(PyObject* py_obj,char* name)
{
return (int) PyLong_AsLong(py_obj);
}
template<>
static long py_to_scalar<long>(PyObject* py_obj,char* name)
{
return (long) PyLong_AsLong(py_obj);
}
template<>
static float py_to_scalar<float>(PyObject* py_obj,char* name)
{
return (float) PyFloat_AsDouble(py_obj);
}
template<>
static double py_to_scalar<double>(PyObject* py_obj,char* name)
{
return PyFloat_AsDouble(py_obj);
}
// complex not checked.
template<>
static std::complex<float> py_to_scalar<std::complex<float> >(PyObject* py_obj,
char* name)
{
return std::complex<float>((float) PyComplex_RealAsDouble(py_obj),
(float) PyComplex_RealAsDouble(py_obj));
}
template<>
static std::complex<double> py_to_scalar<std::complex<double> >(
PyObject* py_obj,char* name)
{
return std::complex<double>(PyComplex_RealAsDouble(py_obj),
PyComplex_RealAsDouble(py_obj));
}
"""
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