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118 lines
4 KiB
ReStructuredText
118 lines
4 KiB
ReStructuredText
.. highlightlang:: c
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.. _typeobjects:
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Type Objects
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------------
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.. index:: object: type
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.. c:type:: PyTypeObject
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The C structure of the objects used to describe built-in types.
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.. c:var:: PyObject* PyType_Type
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This is the type object for type objects; it is the same object as
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:class:`type` in the Python layer.
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.. c:function:: int PyType_Check(PyObject *o)
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Return true if the object *o* is a type object, including instances of types
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derived from the standard type object. Return false in all other cases.
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.. c:function:: int PyType_CheckExact(PyObject *o)
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Return true if the object *o* is a type object, but not a subtype of the
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standard type object. Return false in all other cases.
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.. c:function:: unsigned int PyType_ClearCache()
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Clear the internal lookup cache. Return the current version tag.
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.. c:function:: unsigned long PyType_GetFlags(PyTypeObject* type)
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Return the :c:member:`~PyTypeObject.tp_flags` member of *type*. This function is primarily
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meant for use with `Py_LIMITED_API`; the individual flag bits are
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guaranteed to be stable across Python releases, but access to
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:c:member:`~PyTypeObject.tp_flags` itself is not part of the limited API.
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.. versionadded:: 3.2
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.. versionchanged:: 3.4
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The return type is now ``unsigned long`` rather than ``long``.
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.. c:function:: void PyType_Modified(PyTypeObject *type)
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Invalidate the internal lookup cache for the type and all of its
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subtypes. This function must be called after any manual
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modification of the attributes or base classes of the type.
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.. c:function:: int PyType_HasFeature(PyTypeObject *o, int feature)
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Return true if the type object *o* sets the feature *feature*. Type features
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are denoted by single bit flags.
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.. c:function:: int PyType_IS_GC(PyTypeObject *o)
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Return true if the type object includes support for the cycle detector; this
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tests the type flag :const:`Py_TPFLAGS_HAVE_GC`.
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.. c:function:: int PyType_IsSubtype(PyTypeObject *a, PyTypeObject *b)
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Return true if *a* is a subtype of *b*.
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This function only checks for actual subtypes, which means that
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:meth:`~class.__subclasscheck__` is not called on *b*. Call
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:c:func:`PyObject_IsSubclass` to do the same check that :func:`issubclass`
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would do.
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.. c:function:: PyObject* PyType_GenericAlloc(PyTypeObject *type, Py_ssize_t nitems)
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Generic handler for the :c:member:`~PyTypeObject.tp_alloc` slot of a type object. Use
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Python's default memory allocation mechanism to allocate a new instance and
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initialize all its contents to *NULL*.
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.. c:function:: PyObject* PyType_GenericNew(PyTypeObject *type, PyObject *args, PyObject *kwds)
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Generic handler for the :c:member:`~PyTypeObject.tp_new` slot of a type object. Create a
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new instance using the type's :c:member:`~PyTypeObject.tp_alloc` slot.
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.. c:function:: int PyType_Ready(PyTypeObject *type)
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Finalize a type object. This should be called on all type objects to finish
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their initialization. This function is responsible for adding inherited slots
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from a type's base class. Return ``0`` on success, or return ``-1`` and sets an
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exception on error.
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.. c:function:: PyObject* PyType_FromSpec(PyType_Spec *spec)
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Creates and returns a heap type object from the *spec* passed to the function.
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.. c:function:: PyObject* PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
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Creates and returns a heap type object from the *spec*. In addition to that,
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the created heap type contains all types contained by the *bases* tuple as base
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types. This allows the caller to reference other heap types as base types.
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.. versionadded:: 3.3
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.. c:function:: void* PyType_GetSlot(PyTypeObject *type, int slot)
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Return the function pointer stored in the given slot. If the
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result is *NULL*, this indicates that either the slot is *NULL*,
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or that the function was called with invalid parameters.
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Callers will typically cast the result pointer into the appropriate
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function type.
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.. versionadded:: 3.4
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