#ifndef Py_CPYTHON_TUPLEOBJECT_H

#  error "this header file must not be included directly"

#endif

typedef struct {

    PyObject_VAR_HEAD

    /* Cached hash.  Initially set to -1. */

    Py_hash_t ob_hash;

    /* ob_item contains space for 'ob_size' elements.

       Items must normally not be NULL, except during construction when

       the tuple is not yet visible outside the function that builds it. */

    PyObject *ob_item[1];

} PyTupleObject;

PyAPI_FUNC(int) _PyTuple_Resize(PyObject **, Py_ssize_t);

/* Cast argument to PyTupleObject* type. */

#define _PyTuple_CAST(op) \

    (assert(PyTuple_Check(op)), _Py_CAST(PyTupleObject*, (op)))

// Macros and static inline functions, trading safety for speed

static inline Py_ssize_t PyTuple_GET_SIZE(PyObject *op) {

    PyTupleObject *tuple = _PyTuple_CAST(op);

    return Py_SIZE(tuple);

}

#define PyTuple_GET_SIZE(op) PyTuple_GET_SIZE(_PyObject_CAST(op))

#define PyTuple_GET_ITEM(op, index) (_PyTuple_CAST(op)->ob_item[(index)])

/* Function *only* to be used to fill in brand new tuples */

static inline void

PyTuple_SET_ITEM(PyObject *op, Py_ssize_t index, PyObject *value) {

    PyTupleObject *tuple = _PyTuple_CAST(op);

    assert(0 <= index);

    assert(index < Py_SIZE(tuple));

    tuple->ob_item[index] = value;

}

#define PyTuple_SET_ITEM(op, index, value) \

    PyTuple_SET_ITEM(_PyObject_CAST(op), (index), _PyObject_CAST(value))