cpython/Include/cpython/pyhash.h

#ifndef Py_CPYTHON_HASH_H
#  error "this header file must not be included directly"
#endif

/* Prime multiplier used in string and various other hashes. */
#define PyHASH_MULTIPLIER …

/* Parameters used for the numeric hash implementation.  See notes for
   _Py_HashDouble in Python/pyhash.c.  Numeric hashes are based on
   reduction modulo the prime 2**_PyHASH_BITS - 1. */

#if SIZEOF_VOID_P >= 8
#define PyHASH_BITS …
#else
#define PyHASH_BITS …
#endif

#define PyHASH_MODULUS …
#define PyHASH_INF …
#define PyHASH_IMAG …

/* Aliases kept for backward compatibility with Python 3.12 */
#define _PyHASH_MULTIPLIER …
#define _PyHASH_BITS …
#define _PyHASH_MODULUS …
#define _PyHASH_INF …
#define _PyHASH_IMAG …

/* Helpers for hash functions */
PyAPI_FUNC(Py_hash_t) _Py_HashDouble(PyObject *, double);

// Kept for backward compatibility
#define _Py_HashPointer …


/* hash function definition */
PyHash_FuncDef;

PyAPI_FUNC(PyHash_FuncDef*) PyHash_GetFuncDef(void);

PyAPI_FUNC(Py_hash_t) Py_HashPointer(const void *ptr);
PyAPI_FUNC(Py_hash_t) PyObject_GenericHash(PyObject *);

PyAPI_FUNC(Py_hash_t) Py_HashBuffer(const void *ptr, Py_ssize_t len);