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gh-93442: Make C++ version of _Py_CAST work with 0/NULL. #93500

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Jun 5, 2022
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gh-93442: Make C++ version of _Py_CAST work with 0/NULL. #93500

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8c0e689
Make C++ version of _Py_CAST work with 0/NULL.
nascheme Jun 4, 2022
1456285
Add blurb.
nascheme Jun 4, 2022
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14 changes: 14 additions & 0 deletions Include/pyport.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,23 @@
//
// The type argument must not be a constant type.
#ifdef __cplusplus
#include <cstddef>
# define _Py_STATIC_CAST(type, expr) static_cast<type>(expr)
extern "C++" {
namespace {
template <typename type>
inline type _Py_CAST_impl(long int ptr) {
return reinterpret_cast<type>(ptr);
}
template <typename type>
inline type _Py_CAST_impl(int ptr) {
return reinterpret_cast<type>(ptr);
}
template <typename type>
inline type _Py_CAST_impl(std::nullptr_t) {
return static_cast<type>(nullptr);
}

template <typename type, typename expr_type>
inline type _Py_CAST_impl(expr_type *expr) {
return reinterpret_cast<type>(expr);
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4 changes: 4 additions & 0 deletions Lib/test/_testcppext.cpp
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Expand Up @@ -74,6 +74,10 @@ test_api_casts(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
Py_INCREF(strong_ref);
Py_DECREF(strong_ref);

// gh-93442: Pass 0 as NULL for PyObject*
Py_XINCREF(0);
Py_XDECREF(0);

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nit

Suggested change
Py_XINCREF(nullptr);
Py_XDECREF(nullptr);
Py_XINCREF(NULL);
Py_XDECREF(NULL);

Py_DECREF(obj);
Py_RETURN_NONE;
}
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/C API/2022-06-04-13-15-41.gh-issue-93442.4M4NDb.rst
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@@ -0,0 +1,3 @@
Add C++ overloads for _Py_CAST_impl() to handle 0/NULL. This will allow C++
extensions that pass 0 or NULL to macros using _Py_CAST() to continue to
compile.