cpython/Objects/cellobject.c at 2.7 · python/cpython · GitHub

Name: cpython/Objects/cellobject.c at 2.7 · python/cpython · GitHub
Rating: 4.7 (3971 reviews)
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/* Cell object implementation */

#include"Python.h"

PyObject*
PyCell_New(PyObject*obj)
{
PyCellObject*op;

op= (PyCellObject*)PyObject_GC_New(PyCellObject, &PyCell_Type);
if (op==NULL)
returnNULL;
op->ob_ref=obj;
Py_XINCREF(obj);

_PyObject_GC_TRACK(op);
return (PyObject*)op;
}

PyObject*
PyCell_Get(PyObject*op)
{
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
returnNULL;
 }
Py_XINCREF(((PyCellObject*)op)->ob_ref);
returnPyCell_GET(op);
}

int
PyCell_Set(PyObject*op, PyObject*obj)
{
PyObject*oldobj;
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return-1;
 }
oldobj=PyCell_GET(op);
Py_XINCREF(obj);
PyCell_SET(op, obj);
Py_XDECREF(oldobj);
return0;
}

staticvoid
cell_dealloc(PyCellObject*op)
{
_PyObject_GC_UNTRACK(op);
Py_XDECREF(op->ob_ref);
PyObject_GC_Del(op);
}

staticint
cell_compare(PyCellObject*a, PyCellObject*b)
{
/* Py3K warning for comparisons */
if (PyErr_WarnPy3k("cell comparisons not supported in 3.x",
1) <0) {
return-2;
 }

if (a->ob_ref==NULL) {
if (b->ob_ref==NULL)
return0;
return-1;
 } elseif (b->ob_ref==NULL)
return1;
returnPyObject_Compare(a->ob_ref, b->ob_ref);
}

staticPyObject*
cell_repr(PyCellObject*op)
{
if (op->ob_ref==NULL)
returnPyString_FromFormat("<cell at %p: empty>", op);

returnPyString_FromFormat("<cell at %p: %.80s object at %p>",
op, op->ob_ref->ob_type->tp_name,
op->ob_ref);
}

staticint
cell_traverse(PyCellObject*op, visitprocvisit, void*arg)
{
Py_VISIT(op->ob_ref);
return0;
}

staticint
cell_clear(PyCellObject*op)
{
Py_CLEAR(op->ob_ref);
return0;
}

staticPyObject*
cell_get_contents(PyCellObject*op, void*closure)
{
if (op->ob_ref==NULL)
 {
PyErr_SetString(PyExc_ValueError, "Cell is empty");
returnNULL;
 }
Py_INCREF(op->ob_ref);
returnop->ob_ref;
}

staticPyGetSetDefcell_getsetlist[] = {
 {"cell_contents", (getter)cell_get_contents, NULL},
 {NULL} /* sentinel */
};

PyTypeObjectPyCell_Type= {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"cell",
sizeof(PyCellObject),
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_HAVE_GC, /* tp_flags */
0, /* tp_doc */
 (traverseproc)cell_traverse, /* tp_traverse */
 (inquiry)cell_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
cell_getsetlist, /* tp_getset */
};