Include/tupleobject.h

   1
   2 /* Tuple object interface */
   3
   4 #ifndef Py_TUPLEOBJECT_H
   5 #define Py_TUPLEOBJECT_H
   6 #ifdef __cplusplus
   7 extern "C" {
   8 #endif
   9
  10 /*
  11 Another generally useful object type is a tuple of object pointers.
  12 For Python, this is an immutable type.  C code can change the tuple items
  13 (but not their number), and even use tuples are general-purpose arrays of
  14 object references, but in general only brand new tuples should be mutated,
  15 not ones that might already have been exposed to Python code.
  16
  17 *** WARNING *** PyTuple_SetItem does not increment the new item's reference
  18 count, but does decrement the reference count of the item it replaces,
  19 if not nil.  It does *decrement* the reference count if it is *not*
  20 inserted in the tuple.  Similarly, PyTuple_GetItem does not increment the
  21 returned item's reference count.
  22 */
  23
  24 typedef struct {
  25     PyObject_VAR_HEAD
  26     PyObject *ob_item[1];
  27
  28     /* ob_item contains space for 'ob_size' elements.
  29      * Items must normally not be NULL, except during construction when
  30      * the tuple is not yet visible outside the function that builds it.
  31      */
  32 } PyTupleObject;
  33
  34 PyAPI_DATA(PyTypeObject) PyTuple_Type;
  35
  36 #define PyTuple_Check(op) PyObject_TypeCheck(op, &PyTuple_Type)
  37 #define PyTuple_CheckExact(op) ((op)->ob_type == &PyTuple_Type)
  38
  39 PyAPI_FUNC(PyObject *) PyTuple_New(Py_ssize_t size);
  40 PyAPI_FUNC(Py_ssize_t) PyTuple_Size(PyObject *);
  41 PyAPI_FUNC(PyObject *) PyTuple_GetItem(PyObject *, Py_ssize_t);
  42 PyAPI_FUNC(int) PyTuple_SetItem(PyObject *, Py_ssize_t, PyObject *);
  43 PyAPI_FUNC(PyObject *) PyTuple_GetSlice(PyObject *, Py_ssize_t, Py_ssize_t);
  44 PyAPI_FUNC(int) _PyTuple_Resize(PyObject **, Py_ssize_t);
  45 PyAPI_FUNC(PyObject *) PyTuple_Pack(Py_ssize_t, ...);
  46
  47 /* Macro, trading safety for speed */
  48 #define PyTuple_GET_ITEM(op, i) (((PyTupleObject *)(op))->ob_item[i])
  49 #define PyTuple_GET_SIZE(op)    (((PyTupleObject *)(op))->ob_size)
  50
  51 /* Macro, *only* to be used to fill in brand new tuples */
  52 #define PyTuple_SET_ITEM(op, i, v) (((PyTupleObject *)(op))->ob_item[i] = v)
  53
  54 #ifdef __cplusplus
  55 }
  56 #endif
  57 #endif /* !Py_TUPLEOBJECT_H */