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python-3.7.4-docs-html/_sources/c-api/cell.rst.txt

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+.. highlightlang:: c
+
+.. _cell-objects:
+
+Cell Objects
+------------
+
+"Cell" objects are used to implement variables referenced by multiple scopes.
+For each such variable, a cell object is created to store the value; the local
+variables of each stack frame that references the value contains a reference to
+the cells from outer scopes which also use that variable.  When the value is
+accessed, the value contained in the cell is used instead of the cell object
+itself.  This de-referencing of the cell object requires support from the
+generated byte-code; these are not automatically de-referenced when accessed.
+Cell objects are not likely to be useful elsewhere.
+
+
+.. c:type:: PyCellObject
+
+   The C structure used for cell objects.
+
+
+.. c:var:: PyTypeObject PyCell_Type
+
+   The type object corresponding to cell objects.
+
+
+.. c:function:: int PyCell_Check(ob)
+
+   Return true if *ob* is a cell object; *ob* must not be *NULL*.
+
+
+.. c:function:: PyObject* PyCell_New(PyObject *ob)
+
+   Create and return a new cell object containing the value *ob*. The parameter may
+   be *NULL*.
+
+
+.. c:function:: PyObject* PyCell_Get(PyObject *cell)
+
+   Return the contents of the cell *cell*.
+
+
+.. c:function:: PyObject* PyCell_GET(PyObject *cell)
+
+   Return the contents of the cell *cell*, but without checking that *cell* is
+   non-*NULL* and a cell object.
+
+
+.. c:function:: int PyCell_Set(PyObject *cell, PyObject *value)
+
+   Set the contents of the cell object *cell* to *value*.  This releases the
+   reference to any current content of the cell. *value* may be *NULL*.  *cell*
+   must be non-*NULL*; if it is not a cell object, ``-1`` will be returned.  On
+   success, ``0`` will be returned.
+
+
+.. c:function:: void PyCell_SET(PyObject *cell, PyObject *value)
+
+   Sets the value of the cell object *cell* to *value*.  No reference counts are
+   adjusted, and no checks are made for safety; *cell* must be non-*NULL* and must
+   be a cell object.