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gh-121647: Prefer decltype() for _Py_TYPEOF() on C++ by vstinner · Pull Request #157267 · python/cpython · GitHub

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gh-121647: Prefer decltype() for _Py_TYPEOF() on C++ #157267

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Merged
vstinner merged 4 commits into from
Sep 10, 2026
Conversation 26 Commits 4 Checks 49 Files changed
Merged

gh-121647: Prefer decltype() for _Py_TYPEOF() on C++ #157267

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85a6ba9
gh-121647: Prefer decltype() for _Py_TYPEOF() on C++
vstinner Sep 10, 2026
13de0a0
Use _MSVC_LANG macro
vstinner Sep 10, 2026
ae56459
Fix Py_CLEAR/Py_SETREF macros for C++
vstinner Sep 10, 2026
dec5373
Use Chris's suggestion
vstinner Sep 10, 2026
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4 changes: 2 additions & 2 deletions Include/cpython/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -352,7 +352,7 @@ PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);
#ifdef _Py_TYPEOF
#define Py_SETREF(dst, src) \
do { \
_Py_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \
_Py_TYPEOF(&(dst)) _tmp_dst_ptr = &(dst); \
_Py_TYPEOF(dst) _tmp_old_dst = (*_tmp_dst_ptr); \
*_tmp_dst_ptr = (src); \
Py_DECREF(_tmp_old_dst); \
Expand All @@ -374,7 +374,7 @@ PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);
#ifdef _Py_TYPEOF
#define Py_XSETREF(dst, src) \
do { \
_Py_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \
_Py_TYPEOF(&(dst)) _tmp_dst_ptr = &(dst); \
_Py_TYPEOF(dst) _tmp_old_dst = (*_tmp_dst_ptr); \
*_tmp_dst_ptr = (src); \
Py_XDECREF(_tmp_old_dst); \
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11 changes: 7 additions & 4 deletions Include/pyport.h
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Original file line number Diff line number Diff line change
Expand Up @@ -538,15 +538,18 @@ extern "C" {
//
// Example: _Py_TYPEOF(x) x_copy = (x);
//
// On C23, use typeof(). Otherwise __typeof__() if on GCC, clang or
// MSVC 17.9 and newer. Else if on C++11 or newer, decltype() is used.
// On C23, use typeof(). On C++11, use decltype(). Otherwise, use __typeof__()
// if on GCC, clang or MSVC 17.9 and newer.
//
// On MSVC, check also _MSVC_LANG since __cplusplus is 199711L unless
// the /Zc:__cplusplus flag is used.
#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
# define _Py_TYPEOF(expr) typeof(expr)
#elif defined(__cplusplus) && (__cplusplus >= 201103L || _MSVC_LANG >= 201103L)
# define _Py_TYPEOF(expr) decltype(expr)
#elif defined(__GNUC__) || defined(__clang__) || \
(defined(_MSC_VER) && _MSC_VER >= 1939)
# define _Py_TYPEOF(expr) __typeof__(expr)
#elif defined(__cplusplus) && __cplusplus >= 201103L
# define _Py_TYPEOF(expr) decltype(expr)
#endif


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2 changes: 1 addition & 1 deletion Include/refcount.h
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Expand Up @@ -482,7 +482,7 @@ static inline Py_ALWAYS_INLINE void Py_DECREF(PyObject *op)
#ifdef _Py_TYPEOF
#define Py_CLEAR(op) \
do { \
_Py_TYPEOF(op)* _tmp_op_ptr = &(op); \
_Py_TYPEOF(&(op)) _tmp_op_ptr = &(op); \
_Py_TYPEOF(op) _tmp_old_op = (*_tmp_op_ptr); \
if (_tmp_old_op != _Py_NULL) { \
*_tmp_op_ptr = _Py_NULL; \
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