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.. highlightlang:: c
.. _typeobjects:
Type Objects
------------
.. index:: object: type
.. ctype:: PyTypeObject
The C structure of the objects used to describe built-in types.
.. cvar:: PyObject* PyType_Type
.. index:: single: TypeType (in module types)
This is the type object for type objects; it is the same object as ``type`` and
``types.TypeType`` in the Python layer.
.. cfunction:: int PyType_Check(PyObject *o)
Return true if the object *o* is a type object, including instances of types
derived from the standard type object. Return false in all other cases.
.. cfunction:: int PyType_CheckExact(PyObject *o)
Return true if the object *o* is a type object, but not a subtype of the
standard type object. Return false in all other cases.
.. cfunction:: unsigned int PyType_ClearCache(void)
Clears the internal lookup cache. Return the current version tag.
.. cfunction:: int PyType_HasFeature(PyObject *o, int feature)
Return true if the type object *o* sets the feature *feature*. Type features
are denoted by single bit flags.
.. cfunction:: int PyType_IS_GC(PyObject *o)
Return true if the type object includes support for the cycle detector; this
tests the type flag :const:`Py_TPFLAGS_HAVE_GC`.
.. cfunction:: int PyType_IsSubtype(PyTypeObject *a, PyTypeObject *b)
Return true if *a* is a subtype of *b*.
.. cfunction:: PyObject* PyType_GenericAlloc(PyTypeObject *type, Py_ssize_t nitems)
XXX: Document.
.. cfunction:: PyObject* PyType_GenericNew(PyTypeObject *type, PyObject *args, PyObject *kwds)
XXX: Document.
.. cfunction:: int PyType_Ready(PyTypeObject *type)
Finalize a type object. This should be called on all type objects to finish
their initialization. This function is responsible for adding inherited slots
from a type's base class. Return ``0`` on success, or return ``-1`` and sets an
exception on error.
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