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Don't redefine _Py_NULL macro if already defined #138

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Feb 18, 2025
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Don't redefine _Py_NULL macro if already defined #138

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12 changes: 7 additions & 5 deletions pythoncapi_compat.h
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Original file line number Diff line number Diff line change
Expand Up @@ -37,11 +37,13 @@ extern "C" {
// Static inline functions should use _Py_NULL rather than using directly NULL
// to prevent C++ compiler warnings. On C23 and newer and on C++11 and newer,
// _Py_NULL is defined as nullptr.
#if (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L) \
|| (defined(__cplusplus) && __cplusplus >= 201103)
# define _Py_NULL nullptr
#else
# define _Py_NULL NULL
#ifndef _Py_NULL
# if (defined (__STDC_VERSION__) && __STDC_VERSION__ > 201710L) \
|| (defined(__cplusplus) && __cplusplus >= 201103)
# define _Py_NULL nullptr
# else
# define _Py_NULL NULL
# endif
#endif

// Cast argument to PyObject* type.
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