Issue #15402: Add a __sizeof__ method to struct.Struct.
Initial patch by Serhiy Storchaka.
diff --git a/Modules/_struct.c b/Modules/_struct.c
index 1604b90..0a09fd8 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -1665,6 +1665,22 @@
return PyLong_FromSsize_t(self->s_size);
}
+PyDoc_STRVAR(s_sizeof__doc__,
+"S.__sizeof__() -> size of S in memory, in bytes");
+
+static PyObject *
+s_sizeof(PyStructObject *self)
+{
+ Py_ssize_t size;
+ formatcode *code;
+
+ size = sizeof(PyStructObject) + sizeof(formatcode);
+ for (code = self->s_codes; code->fmtdef != NULL; code++) {
+ size += sizeof(formatcode);
+ }
+ return PyLong_FromSsize_t(size);
+}
+
/* List of functions */
static struct PyMethodDef s_methods[] = {
@@ -1673,6 +1689,7 @@
{"unpack", s_unpack, METH_O, s_unpack__doc__},
{"unpack_from", (PyCFunction)s_unpack_from, METH_VARARGS|METH_KEYWORDS,
s_unpack_from__doc__},
+ {"__sizeof__", (PyCFunction)s_sizeof, METH_NOARGS, s_sizeof__doc__},
{NULL, NULL} /* sentinel */
};