# デスクリプタオブジェクト (descriptor object)

"デスクリプタ (descriptor)" は、あるオブジェクトのいくつかの属性について記述したオブジェクトです。デスクリプタオブジェクトは型オブジェクトの辞書内にあります。

PyObject *PyDescr_NewGetSet(PyTypeObject *type, struct PyGetSetDef *getset)
  戻り値: 新しい参照。 次に属します: Stable ABI.

PyObject *PyDescr_NewMember(PyTypeObject *type, struct PyMemberDef *meth)
  戻り値: 新しい参照。 次に属します: Stable ABI.

PyTypeObject PyMemberDescr_Type
  次に属します: Stable ABI.

  The type object for member descriptor objects created from `PyMemberDef` structures. These descriptors expose fields of a C struct as attributes on a type, and correspond to `types.MemberDescriptorType` objects in Python.

PyTypeObject PyGetSetDescr_Type
  次に属します: Stable ABI.

  The type object for get/set descriptor objects created from `PyGetSetDef` structures. These descriptors implement attributes whose value is computed by C getter and setter functions, and are used for many built-in type attributes.

PyObject *PyDescr_NewMethod(PyTypeObject *type, struct PyMethodDef *meth)
  戻り値: 新しい参照。 次に属します: Stable ABI.

PyTypeObject PyMethodDescr_Type
  次に属します: Stable ABI.

  The type object for method descriptor objects created from `PyMethodDef` structures. These descriptors expose C functions as methods on a type, and correspond to `types.MemberDescriptorType` objects in Python.

PyObject *PyDescr_NewWrapper(PyTypeObject *type, struct wrapperbase *wrapper, void *wrapped)
  戻り値: 新しい参照。

PyTypeObject PyWrapperDescr_Type
  次に属します: Stable ABI.

  The type object for wrapper descriptor objects created by `PyDescr_NewWrapper()` and `PyWrapper_New()`. Wrapper descriptors are used internally to expose special methods implemented via wrapper structures, and appear in Python as `types.WrapperDescriptorType` objects.

PyObject *PyDescr_NewClassMethod(PyTypeObject *type, PyMethodDef *method)
  戻り値: 新しい参照。 次に属します: Stable ABI.

int PyDescr_IsData(PyObject *descr)

  Return non-zero if the descriptor object descr describes a data attribute, or `0` if it describes a method. descr must be a descriptor object; there is no error checking.

PyObject *PyWrapper_New(PyObject*, PyObject*)
  戻り値: 新しい参照。 次に属します: Stable ABI.

PyDescr_COMMON

  This is a soft deprecated macro including the common fields for a descriptor object.

  This was included in Python's C API by mistake; do not use it in extensions. For creating custom descriptor objects, create a class implementing the descriptor protocol (`tp_descr_get` and `tp_descr_set`).

## Built-in descriptors

PyTypeObject PyProperty_Type
  次に属します: Stable ABI.

  The type object for property objects. This is the same object as `property` in the Python layer.

PyTypeObject PySuper_Type
  次に属します: Stable ABI.

  The type object for super objects. This is the same object as `super` in the Python layer.

PyTypeObject PyClassMethod_Type

  The type of class method objects. This is the same object as `classmethod` in the Python layer.

PyTypeObject PyClassMethodDescr_Type
  次に属します: Stable ABI.

  The type object for C-level class method descriptor objects. This is the type of the descriptors created for `classmethod()` defined in C extension types, and is the same object as `classmethod` in Python.

PyObject *PyClassMethod_New(PyObject *callable)

  Create a new `classmethod` object wrapping callable. callable must be a callable object and must not be `NULL`.

  On success, this function returns a strong reference to a new class method descriptor. On failure, this function returns `NULL` with an exception set.

PyTypeObject PyStaticMethod_Type

  The type of static method objects. This is the same object as `staticmethod` in the Python layer.

PyObject *PyStaticMethod_New(PyObject *callable)

  Create a new `staticmethod` object wrapping callable. callable must be a callable object and must not be `NULL`.

  On success, this function returns a strong reference to a new static method descriptor. On failure, this function returns `NULL` with an exception set.