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/* Float object interface */

PyFloatObject represents a (double precision) floating point number.

#ifndef Py_FLOATOBJECT_H

#define Py_FLOATOBJECT_H

#ifdef __cplusplus

extern "C" {

#endif

#ifndef Py_LIMITED_API

typedef struct {

PyObject_HEAD

double ob_fval;

} PyFloatObject;

#endif

PyAPI_DATA(PyTypeObject) PyFloat_Type;

#define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)

#define PyFloat_CheckExact(op) (Py_TYPE(op) == &PyFloat_Type)

#ifdef Py_NAN

#define Py_RETURN_NAN return PyFloat_FromDouble(Py_NAN)

#endif

#define Py_RETURN_INF(sign) do \

if (copysign(1., sign) == 1.) { \

return PyFloat_FromDouble(Py_HUGE_VAL); \

} else { \

return PyFloat_FromDouble(-Py_HUGE_VAL); \

} while(0)

PyAPI_FUNC(double) PyFloat_GetMax(void);

PyAPI_FUNC(double) PyFloat_GetMin(void);

PyAPI_FUNC(PyObject *) PyFloat_GetInfo(void);

/* Return Python float from string PyObject. */

PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*);

/* Return Python float from C double. */

PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);

/* Extract C double from Python float. The macro version trades safety for

speed. */

PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);

#ifndef Py_LIMITED_API

#define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)

#endif

#ifndef Py_LIMITED_API

/* _PyFloat_{Pack,Unpack}{4,8}

* The struct and pickle (at least) modules need an efficient platform-

* independent way to store floating-point values as byte strings.

* The Pack routines produce a string from a C double, and the Unpack

* routines produce a C double from such a string. The suffix (4 or 8)

* specifies the number of bytes in the string.

* On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats

* these functions work by copying bits. On other platforms, the formats the

* 4- byte format is identical to the IEEE-754 single precision format, and

* the 8-byte format to the IEEE-754 double precision format, although the

* packing of INFs and NaNs (if such things exist on the platform) isn't

* handled correctly, and attempting to unpack a string containing an IEEE

* INF or NaN will raise an exception.

* On non-IEEE platforms with more precision, or larger dynamic range, than

* 754 supports, not all values can be packed; on non-IEEE platforms with less

* precision, or smaller dynamic range, not all values can be unpacked. What

* happens in such cases is partly accidental (alas).

/* The pack routines write 2, 4 or 8 bytes, starting at p. le is a bool

* argument, true if you want the string in little-endian format (exponent

* last, at p+1, p+3 or p+7), false if you want big-endian format (exponent

* first, at p).

* Return value: 0 if all is OK, -1 if error (and an exception is

* set, most likely OverflowError).

* There are two problems on non-IEEE platforms:

* 1): What this does is undefined if x is a NaN or infinity.

* 2): -0.0 and +0.0 produce the same string.

PyAPI_FUNC(int) _PyFloat_Pack2(double x, unsigned char *p, int le);

PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);

PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);

/* Needed for the old way for marshal to store a floating point number.

Returns the string length copied into p, -1 on error.

PyAPI_FUNC(int) _PyFloat_Repr(double x, char *p, size_t len);

/* Used to get the important decimal digits of a double */

PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum);

PyAPI_FUNC(void) _PyFloat_DigitsInit(void);

/* The unpack routines read 2, 4 or 8 bytes, starting at p. le is a bool

* argument, true if the string is in little-endian format (exponent

* last, at p+1, p+3 or p+7), false if big-endian (exponent first, at p).

* Return value: The unpacked double. On error, this is -1.0 and

* PyErr_Occurred() is true (and an exception is set, most likely

* OverflowError). Note that on a non-IEEE platform this will refuse

* to unpack a string that represents a NaN or infinity.

PyAPI_FUNC(double) _PyFloat_Unpack2(const unsigned char *p, int le);

PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);

PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);

/* free list api */

PyAPI_FUNC(int) PyFloat_ClearFreeList(void);

PyAPI_FUNC(void) _PyFloat_DebugMallocStats(FILE* out);

/* Format the object based on the format_spec, as defined in PEP 3101

(Advanced String Formatting). */

PyAPI_FUNC(int) _PyFloat_FormatAdvancedWriter(

_PyUnicodeWriter *writer,

PyObject *obj,

PyObject *format_spec,

Py_ssize_t start,

Py_ssize_t end);

#endif /* Py_LIMITED_API */

#ifdef __cplusplus

}

#endif

#endif /* !Py_FLOATOBJECT_H */

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