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| author | Victor Stinner <vstinner@python.org> | 2021-04-30 10:46:15 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-04-30 10:46:15 (GMT) |
| commit | 3bb09947ec4837de75532e21dd4bd25db0a1f1b7 (patch) | |
| tree | 46469716b18eda1c8af7c311b6187fda39a146c1 /Include | |
| parent | b73b5fb9ea08156991a065c1696e8d8cf7622482 (diff) | |
| download | cpython-3bb09947ec4837de75532e21dd4bd25db0a1f1b7.zip cpython-3bb09947ec4837de75532e21dd4bd25db0a1f1b7.tar.gz cpython-3bb09947ec4837de75532e21dd4bd25db0a1f1b7.tar.bz2 | |
bpo-43916: Add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag (GH-25721)
Add a new Py_TPFLAGS_DISALLOW_INSTANTIATION type flag to disallow
creating type instances: set tp_new to NULL and don't create the
"__new__" key in the type dictionary.
The flag is set automatically on static types if tp_base is NULL or
&PyBaseObject_Type and tp_new is NULL.
Use the flag on the following types:
* _curses.ncurses_version type
* _curses_panel.panel
* _tkinter.Tcl_Obj
* _tkinter.tkapp
* _tkinter.tktimertoken
* _xxsubinterpretersmodule.ChannelID
* sys.flags type
* sys.getwindowsversion() type
* sys.version_info type
Update MyStr example in the C API documentation to use
Py_TPFLAGS_DISALLOW_INSTANTIATION.
Add _PyStructSequence_InitType() function to create a structseq type
with the Py_TPFLAGS_DISALLOW_INSTANTIATION flag set.
type_new() calls _PyType_CheckConsistency() at exit.
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/object.h | 4 | ||||
| -rw-r--r-- | Include/structseq.h | 6 |
2 files changed, 10 insertions, 0 deletions
diff --git a/Include/object.h b/Include/object.h index cffe72c..4c06999 100644 --- a/Include/object.h +++ b/Include/object.h @@ -327,6 +327,10 @@ given type object has a specified feature. #define Py_TPFLAGS_MAPPING (1 << 6) #endif +/* Disallow creating instances of the type: set tp_new to NULL and don't create + * the "__new__" key in the type dictionary. */ +#define Py_TPFLAGS_DISALLOW_INSTANTIATION (1UL << 7) + /* Set if the type object is immutable: type attributes cannot be set nor deleted */ #define Py_TPFLAGS_IMMUTABLETYPE (1UL << 8) diff --git a/Include/structseq.h b/Include/structseq.h index 8f51c89..af3af41 100644 --- a/Include/structseq.h +++ b/Include/structseq.h @@ -27,6 +27,12 @@ PyAPI_FUNC(void) PyStructSequence_InitType(PyTypeObject *type, PyAPI_FUNC(int) PyStructSequence_InitType2(PyTypeObject *type, PyStructSequence_Desc *desc); #endif +#ifdef Py_BUILD_CORE +extern int _PyStructSequence_InitType( + PyTypeObject *type, + PyStructSequence_Desc *desc, + unsigned long tp_flags); +#endif PyAPI_FUNC(PyTypeObject*) PyStructSequence_NewType(PyStructSequence_Desc *desc); PyAPI_FUNC(PyObject *) PyStructSequence_New(PyTypeObject* type); |