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bpo-43753: Add Py_Is() and Py_IsNone() functions (GH-25227)

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Add the Py_Is(x, y) function to test if the 'x' object is the 'y'
object, the same as "x is y" in Python. Add also the Py_IsNone(),
Py_IsTrue(), Py_IsFalse() functions to test if an object is,
respectively, the None singleton, the True singleton or the False
singleton.
This commit is contained in:
Victor Stinner 2021-04-11 00:17:39 +02:00 • committed by GitHub
parent 6e468cb16b
commit 09bbebea16
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9 changed files with 198 additions and 38 deletions
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Include/object.h
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@ -122,6 +122,11 @@ typedef struct {
#define _PyVarObject_CAST_CONST(op) ((const PyVarObject*)(op))
// Test if the 'x' object is the 'y' object, the same as "x is y" in Python.
PyAPI_FUNC(int) Py_Is(PyObject *x, PyObject *y);
#define Py_Is(x, y) ((x) == (y))
static inline Py_ssize_t _Py_REFCNT(const PyObject *ob) {
return ob->ob_refcnt;
}
@ -586,6 +591,10 @@ Don't forget to apply Py_INCREF() when returning this value!!!
PyAPI_DATA(PyObject) _Py_NoneStruct; /* Don't use this directly */
#define Py_None (&_Py_NoneStruct)
// Test if an object is the None singleton, the same as "x is None" in Python.
PyAPI_FUNC(int) Py_IsNone(PyObject *x);
#define Py_IsNone(x) Py_Is((x), Py_None)
/* Macro for returning Py_None from a function */
#define Py_RETURN_NONE return Py_NewRef(Py_None)