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cpython/Include/floatobject.h at 3.5 · python/cpython · GitHub
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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 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+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_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 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+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_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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