1  #ifndef Py_CPYTHON_TUPLEOBJECT_H
       2  #  error "this header file must not be included directly"
       3  #endif
       4  
       5  typedef struct {
       6      PyObject_VAR_HEAD
       7      /* ob_item contains space for 'ob_size' elements.
       8         Items must normally not be NULL, except during construction when
       9         the tuple is not yet visible outside the function that builds it. */
      10      PyObject *ob_item[1];
      11  } PyTupleObject;
      12  
      13  PyAPI_FUNC(int) _PyTuple_Resize(PyObject **, Py_ssize_t);
      14  PyAPI_FUNC(void) _PyTuple_MaybeUntrack(PyObject *);
      15  
      16  /* Cast argument to PyTupleObject* type. */
      17  #define _PyTuple_CAST(op) \
      18      (assert(PyTuple_Check(op)), _Py_CAST(PyTupleObject*, (op)))
      19  
      20  // Macros and static inline functions, trading safety for speed
      21  
      22  static inline Py_ssize_t PyTuple_GET_SIZE(PyObject *op) {
      23      PyTupleObject *tuple = _PyTuple_CAST(op);
      24      return Py_SIZE(tuple);
      25  }
      26  #define PyTuple_GET_SIZE(op) PyTuple_GET_SIZE(_PyObject_CAST(op))
      27  
      28  #define PyTuple_GET_ITEM(op, index) (_PyTuple_CAST(op)->ob_item[(index)])
      29  
      30  /* Function *only* to be used to fill in brand new tuples */
      31  static inline void
      32  PyTuple_SET_ITEM(PyObject *op, Py_ssize_t index, PyObject *value) {
      33      PyTupleObject *tuple = _PyTuple_CAST(op);
      34      tuple->ob_item[index] = value;
      35  }
      36  #define PyTuple_SET_ITEM(op, index, value) \
      37      PyTuple_SET_ITEM(_PyObject_CAST(op), (index), _PyObject_CAST(value))
      38  
      39  PyAPI_FUNC(void) _PyTuple_DebugMallocStats(FILE *out);