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/* Cell object implementation */
#include "Python.h"
PyObject *
PyCell_New(PyObject *obj)
{
PyCellObject *op;
op = (PyCellObject *)PyObject_New(PyCellObject, &PyCell_Type);
op->ob_ref = obj;
Py_XINCREF(obj);
PyObject_GC_Init(op);
return (PyObject *)op;
}
PyObject *
PyCell_Get(PyObject *op)
{
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
Py_XINCREF(((PyCellObject*)op)->ob_ref);
return PyCell_GET(op);
}
int
PyCell_Set(PyObject *op, PyObject *obj)
{
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
Py_XDECREF(((PyCellObject*)op)->ob_ref);
Py_XINCREF(obj);
PyCell_SET(op, obj);
return 0;
}
static void
cell_dealloc(PyCellObject *op)
{
PyObject_GC_Fini(op);
Py_XDECREF(op->ob_ref);
PyObject_Del(op);
}
static int
cell_compare(PyCellObject *a, PyCellObject *b)
{
if (a->ob_ref == NULL) {
if (b->ob_ref == NULL)
return 0;
return -1;
} else if (b->ob_ref == NULL)
return 1;
return PyObject_Compare(a->ob_ref, b->ob_ref);
}
static PyObject *
cell_repr(PyCellObject *op)
{
char buf[256];
if (op->ob_ref == NULL)
sprintf(buf, "<cell at %p: empty>", op);
else
sprintf(buf, "<cell at %p: %.80s object at %p>",
op, op->ob_ref->ob_type->tp_name, op->ob_ref);
return PyString_FromString(buf);
}
static int
cell_traverse(PyCellObject *op, visitproc visit, void *arg)
{
if (op->ob_ref)
return visit(op->ob_ref, arg);
return 0;
}
static int
cell_clear(PyCellObject *op)
{
Py_XDECREF(op->ob_ref);
op->ob_ref = NULL;
return 0;
}
PyTypeObject PyCell_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"cell",
sizeof(PyCellObject) + PyGC_HEAD_SIZE,
0,
(destructor)cell_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
(cmpfunc)cell_compare, /* tp_compare */
(reprfunc)cell_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)cell_traverse, /* tp_traverse */
(inquiry)cell_clear, /* tp_clear */
};
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