opencv/modules/python/src2/pycompat.hpp

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// Defines for Python 2/3 compatibility.
#ifndef __PYCOMPAT_HPP__
#define __PYCOMPAT_HPP__
#if PY_MAJOR_VERSION >= 3
// Python3 treats all ints as longs, PyInt_X functions have been removed.
#define PyInt_Check PyLong_Check
#define PyInt_CheckExact PyLong_CheckExact
#define PyInt_AsLong PyLong_AsLong
#define PyInt_AS_LONG PyLong_AS_LONG
#define PyInt_FromLong PyLong_FromLong
#define PyNumber_Int PyNumber_Long
// Python3 strings are unicode, these defines mimic the Python2 functionality.
#define PyString_Check PyUnicode_Check
#define PyString_FromString PyUnicode_FromString
#define PyString_AsString PyUnicode_AsUTF8
#define PyString_FromStringAndSize PyUnicode_FromStringAndSize
#define PyString_Size PyUnicode_GET_SIZE
#endif
#endif // END HEADER GUARD