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Edit File : floatobject.h \| Size : 4.68 KB
/* 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 */ Back

Edit File : floatobject.h | Size : 4.68 KB

/* 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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