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The C and C++ Include Header Files

cat -n /usr/include/python3.14/cpython/tupleobject.h

     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	    /* Cached hash.  Initially set to -1. */
     8	    Py_hash_t ob_hash;
     9	    /* ob_item contains space for 'ob_size' elements.
    10	       Items must normally not be NULL, except during construction when
    11	       the tuple is not yet visible outside the function that builds it. */
    12	    PyObject *ob_item[1];
    13	} PyTupleObject;
    14	
    15	PyAPI_FUNC(int) _PyTuple_Resize(PyObject **, Py_ssize_t);
    16	
    17	/* Cast argument to PyTupleObject* type. */
    18	#define _PyTuple_CAST(op) \
    19	    (assert(PyTuple_Check(op)), _Py_CAST(PyTupleObject*, (op)))
    20	
    21	// Macros and static inline functions, trading safety for speed
    22	
    23	static inline Py_ssize_t PyTuple_GET_SIZE(PyObject *op) {
    24	    PyTupleObject *tuple = _PyTuple_CAST(op);
    25	    return Py_SIZE(tuple);
    26	}
    27	#define PyTuple_GET_SIZE(op) PyTuple_GET_SIZE(_PyObject_CAST(op))
    28	
    29	#define PyTuple_GET_ITEM(op, index) (_PyTuple_CAST(op)->ob_item[(index)])
    30	
    31	/* Function *only* to be used to fill in brand new tuples */
    32	static inline void
    33	PyTuple_SET_ITEM(PyObject *op, Py_ssize_t index, PyObject *value) {
    34	    PyTupleObject *tuple = _PyTuple_CAST(op);
    35	    assert(0 <= index);
    36	    assert(index < Py_SIZE(tuple));
    37	    tuple->ob_item[index] = value;
    38	}
    39	#define PyTuple_SET_ITEM(op, index, value) \
    40	    PyTuple_SET_ITEM(_PyObject_CAST(op), (index), _PyObject_CAST(value))