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The C and C++ Include Header Files

/usr/include/python3.12/cpython/floatobject.h

$ cat -n /usr/include/python3.12/cpython/floatobject.h

     1	#ifndef Py_CPYTHON_FLOATOBJECT_H
     2	#  error "this header file must not be included directly"
     3	#endif
     4	
     5	typedef struct {
     6	    PyObject_HEAD
     7	    double ob_fval;
     8	} PyFloatObject;
     9	
    10	#define _PyFloat_CAST(op) \
    11	    (assert(PyFloat_Check(op)), _Py_CAST(PyFloatObject*, op))
    12	
    13	// Static inline version of PyFloat_AsDouble() trading safety for speed.
    14	// It doesn't check if op is a double object.
    15	static inline double PyFloat_AS_DOUBLE(PyObject *op) {
    16	    return _PyFloat_CAST(op)->ob_fval;
    17	}
    18	#define PyFloat_AS_DOUBLE(op) PyFloat_AS_DOUBLE(_PyObject_CAST(op))
    19	
    20	
    21	PyAPI_FUNC(int) PyFloat_Pack2(double x, char *p, int le);
    22	PyAPI_FUNC(int) PyFloat_Pack4(double x, char *p, int le);
    23	PyAPI_FUNC(int) PyFloat_Pack8(double x, char *p, int le);
    24	
    25	PyAPI_FUNC(double) PyFloat_Unpack2(const char *p, int le);
    26	PyAPI_FUNC(double) PyFloat_Unpack4(const char *p, int le);
    27	PyAPI_FUNC(double) PyFloat_Unpack8(const char *p, int le);

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