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#include "Python.h"
#include "structmember.h" /* for offset of macro if needed */
#include "numpy/arrayobject.h"
/* Use a Python float as the canonical type being added
*/
typedef struct _floatint {
PyObject_HEAD
npy_int32 first;
npy_int32 last;
} PyFloatIntObject;
static PyTypeObject PyFloatInt_Type = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"floatint.floatint", /*tp_name*/
sizeof(PyFloatIntObject), /*tp_basicsize*/
};
static PyArray_ArrFuncs _PyFloatInt_Funcs;
#define _ALIGN(type) offsetof(struct {char c; type v;},v)
/* The scalar-type */
static PyArray_Descr _PyFloatInt_Dtype = {
PyObject_HEAD_INIT(NULL)
&PyFloatInt_Type,
'f',
'0',
'=',
0,
0,
sizeof(double),
_ALIGN(double),
NULL,
NULL,
NULL,
&_PyFloatInt_Funcs
};
static void
twoint_copyswap(void *dst, void *src, int swap, void *arr)
{
if (src != NULL) {
memcpy(dst, src, sizeof(double));
}
if (swap) {
register char *a, *b, c;
a = (char *)dst;
b = a + 7;
c = *a; *a++ = *b; *b-- = c;
c = *a; *a++ = *b; *b-- = c;
c = *a; *a++ = *b; *b-- = c;
c = *a; *a++ = *b; *b = c;
}
}
static PyObject *
twoint_getitem(char *ip, PyArrayObject *ap) {
npy_int32 a[2];
if ((ap==NULL) || PyArray_ISBEHAVED_RO(ap)) {
a[0] = *((npy_int32 *)ip);
a[1] = *((npy_int32 *)ip + 1);
}
else {
ap->descr->f->copyswap(a, ip, !PyArray_ISNOTSWAPPED(ap), ap);
}
return Py_BuildValue("(ii)", a[0], a[1]);
}
static int
twoint_setitem(PyObject *op, char *ov, PyArrayObject *ap) {
npy_int32 a[2];
if (!PyTuple_Check(op)) {
PyErr_SetString(PyExc_TypeError, "must be a tuple");
return -1;
}
if (!PyArg_ParseTuple(op, "ii", a, a+1)) return -1;
if (ap == NULL || PyArray_ISBEHAVED(ap)) {
memcpy(ov, a, sizeof(double));
}
else {
ap->descr->f->copyswap(ov, a, !PyArray_ISNOTSWAPPED(ap), ap);
}
return 0;
}
static PyArray_Descr * _register_dtype(void)
{
int userval;
PyArray_InitArrFuncs(&_PyFloatInt_Funcs);
/* Add copyswap,
nonzero, getitem, setitem*/
_PyFloatInt_Funcs.copyswap = twoint_copyswap;
_PyFloatInt_Funcs.getitem = (PyArray_GetItemFunc *)twoint_getitem;
_PyFloatInt_Funcs.setitem = (PyArray_SetItemFunc *)twoint_setitem;
_PyFloatInt_Dtype.ob_type = &PyArrayDescr_Type;
userval = PyArray_RegisterDataType(&_PyFloatInt_Dtype);
return PyArray_DescrFromType(userval);
}
/* Initialization function for the module (*must* be called init<name>) */
PyMODINIT_FUNC initfloatint(void) {
PyObject *m, *d;
PyArray_Descr *dtype;
/* Create the module and add the functions */
m = Py_InitModule("floatint", NULL);
/* Import the array objects */
import_array();
/* Initialize the new float type */
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
if (PyType_Ready(&PyFloat_Type) < 0) return;
PyFloatInt_Type.tp_base = &PyFloat_Type;
/* This is only needed because we are sub-typing the
Float type and must pre-set some function pointers
to get PyType_Ready to fill in the rest.
*/
PyFloatInt_Type.tp_alloc = PyType_GenericAlloc;
PyFloatInt_Type.tp_new = PyFloat_Type.tp_new;
PyFloatInt_Type.tp_dealloc = PyFloat_Type.tp_dealloc;
PyFloatInt_Type.tp_free = PyObject_Del;
if (PyType_Ready(&PyFloatInt_Type) < 0) return;
/* End specific code */
dtype = _register_dtype();
Py_XINCREF(dtype);
if (dtype != NULL) {
PyDict_SetItemString(d, "floatint_type", (PyObject *)dtype);
}
Py_INCREF(&PyFloatInt_Type);
PyDict_SetItemString(d, "floatint", (PyObject *)&PyFloatInt_Type);
return;
}
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