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gh-94731: Revert to C-style casts for _Py_CAST (GH-94782) (#94849)

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Co-authored-by: da-woods <dw-git@d-woods.co.uk>
(cherry picked from commit 6cbb57f62d)
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Miss Islington (bot) 2022-07-15 00:35:23 -07:00 • committed by GitHub
parent a6c4ca9b7c
commit d9107aa015
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5 changed files with 85 additions and 59 deletions
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54
Include/pyport.h
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@ -14,62 +14,14 @@
#endif
// Macro to use C++ static_cast<>, reinterpret_cast<> and const_cast<>
// in the Python C API.
//
// In C++, _Py_CAST(type, expr) converts a constant expression to a
// non constant type using const_cast<type>. For example,
// _Py_CAST(PyObject*, op) can convert a "const PyObject*" to
// "PyObject*".
//
// The type argument must not be a constant type.
// Macro to use C++ static_cast<> in the Python C API.
#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);
}
#if __cplusplus >= 201103
template <typename type>
inline type _Py_CAST_impl(std::nullptr_t) {
return static_cast<type>(nullptr);
}
#endif
template <typename type, typename expr_type>
inline type _Py_CAST_impl(expr_type *expr) {
return reinterpret_cast<type>(expr);
}
template <typename type, typename expr_type>
inline type _Py_CAST_impl(expr_type const *expr) {
return reinterpret_cast<type>(const_cast<expr_type *>(expr));
}
template <typename type, typename expr_type>
inline type _Py_CAST_impl(expr_type &expr) {
return static_cast<type>(expr);
}
template <typename type, typename expr_type>
inline type _Py_CAST_impl(expr_type const &expr) {
return static_cast<type>(const_cast<expr_type &>(expr));
}
}
}
# define _Py_CAST(type, expr) _Py_CAST_impl<type>(expr)
#else
# define _Py_STATIC_CAST(type, expr) ((type)(expr))
# define _Py_CAST(type, expr) ((type)(expr))
#endif
// Macro to use the more powerful/dangerous C-style cast even in C++.
#define _Py_CAST(type, expr) ((type)(expr))
// Static inline functions should use _Py_NULL rather than using directly NULL
// to prevent C++ compiler warnings. On C++11 and newer, _Py_NULL is defined as