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GH-92898: Make _Py_Cast C++ version compatible with cast operator (gh-92951)

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serge-sans-paille 2022-05-21 13:16:37 +00:00 committed by GitHub
parent 14c0d33016
commit 5b71b519f9
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2 changed files with 35 additions and 2 deletions
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28
Include/pyport.h
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@ -26,8 +26,32 @@
// _Py_CAST(const PyObject*, expr) fails with a compiler error.
#ifdef __cplusplus
# define _Py_STATIC_CAST(type, expr) static_cast<type>(expr)
# define _Py_CAST(type, expr) \
const_cast<type>(reinterpret_cast<const type>(expr))
extern "C++" {
namespace {
template <typename type, typename expr_type>
inline type _Py_reinterpret_cast_impl(expr_type *expr) {
return reinterpret_cast<type>(expr);
}
template <typename type, typename expr_type>
inline type _Py_reinterpret_cast_impl(expr_type const *expr) {
return reinterpret_cast<type>(const_cast<expr_type *>(expr));
}
template <typename type, typename expr_type>
inline type _Py_reinterpret_cast_impl(expr_type &expr) {
return static_cast<type>(expr);
}
template <typename type, typename expr_type>
inline type _Py_reinterpret_cast_impl(expr_type const &expr) {
return static_cast<type>(const_cast<expr_type &>(expr));
}
} // namespace
}
# define _Py_CAST(type, expr) _Py_reinterpret_cast_impl<type>(expr)
#else
# define _Py_STATIC_CAST(type, expr) ((type)(expr))
# define _Py_CAST(type, expr) ((type)(expr))

9
Lib/test/_testcppext.cpp
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@ -40,6 +40,15 @@ test_api_casts(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
PyTypeObject *type = Py_TYPE(const_obj);
assert(Py_REFCNT(const_obj) >= 1);
struct PyObjectProxy {
PyObject* obj;
operator PyObject *() { return obj; }
} proxy_obj = { obj };
Py_INCREF(proxy_obj);
Py_DECREF(proxy_obj);
assert(Py_REFCNT(proxy_obj) >= 1);
assert(type == &PyTuple_Type);
assert(PyTuple_GET_SIZE(const_obj) == 2);
PyObject *one = PyTuple_GET_ITEM(const_obj, 0);