[3.11] gh-93442: Make C++ version of _Py_CAST work with 0/NULL. (GH-93500) #93507
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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. Without this, you get an error like:
The modern way to use a NULL value in C++ is to use nullptr. However,
we want to not break extensions that do things the old way.
Co-authored-by: serge-sans-paille
(cherry picked from commit 8bcc3fa)
Co-authored-by: Neil Schemenauer nas-github@arctrix.com