| 1 |
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| 2 | /* Float object interface */
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| 3 |
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| 4 | /*
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| 5 | PyFloatObject represents a (double precision) floating point number.
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| 6 | */
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| 7 |
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| 8 | #ifndef Py_FLOATOBJECT_H
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| 9 | #define Py_FLOATOBJECT_H
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| 10 | #ifdef __cplusplus
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| 11 | extern "C" {
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| 12 | #endif
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| 13 |
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| 14 | typedef struct {
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| 15 | PyObject_HEAD
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| 16 | double ob_fval;
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| 17 | } PyFloatObject;
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| 18 |
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| 19 | PyAPI_DATA(PyTypeObject) PyFloat_Type;
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| 20 |
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| 21 | #define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)
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| 22 | #define PyFloat_CheckExact(op) ((op)->ob_type == &PyFloat_Type)
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| 23 |
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| 24 | /* Return Python float from string PyObject. Second argument ignored on
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| 25 | input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
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| 26 | purpose once but can't be made to work as intended). */
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| 27 | PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*, char** junk);
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| 28 |
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| 29 | /* Return Python float from C double. */
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| 30 | PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
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| 31 |
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| 32 | /* Extract C double from Python float. The macro version trades safety for
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| 33 | speed. */
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| 34 | PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
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| 35 | #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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| 36 |
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| 37 | /* Write repr(v) into the char buffer argument, followed by null byte. The
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| 38 | buffer must be "big enough"; >= 100 is very safe.
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| 39 | PyFloat_AsReprString(buf, x) strives to print enough digits so that
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| 40 | PyFloat_FromString(buf) then reproduces x exactly. */
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| 41 | PyAPI_FUNC(void) PyFloat_AsReprString(char*, PyFloatObject *v);
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| 42 |
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| 43 | /* Write str(v) into the char buffer argument, followed by null byte. The
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| 44 | buffer must be "big enough"; >= 100 is very safe. Note that it's
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| 45 | unusual to be able to get back the float you started with from
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| 46 | PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
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| 47 | preserve precision across conversions. */
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| 48 | PyAPI_FUNC(void) PyFloat_AsString(char*, PyFloatObject *v);
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| 49 |
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| 50 | /* _PyFloat_{Pack,Unpack}{4,8}
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| 51 | *
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| 52 | * The struct and pickle (at least) modules need an efficient platform-
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| 53 | * independent way to store floating-point values as byte strings.
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| 54 | * The Pack routines produce a string from a C double, and the Unpack
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| 55 | * routines produce a C double from such a string. The suffix (4 or 8)
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| 56 | * specifies the number of bytes in the string.
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| 57 | *
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