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annotate Include/floatobject.h @ 41601:b39abcbbbbba

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It's ok for __repr__ to return unicode.
author Guido van Rossum <guido@python.org>
date Fri, 04 May 2007 05:14:29 +0000
parents 1f843890a4e6
children e70cdce0e8b2
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853b736a6a9e Added copyright notice.
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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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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. */
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25 PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*);
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26
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27 /* Return Python float from C double. */
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28 PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
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29
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30 /* Extract C double from Python float. The macro version trades safety for
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31 speed. */
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32 PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
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33 #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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34
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35 /* _PyFloat_{Pack,Unpack}{4,8}
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36 *
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37 * The struct and pickle (at least) modules need an efficient platform-
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38 * independent way to store floating-point values as byte strings.
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39 * The Pack routines produce a string from a C double, and the Unpack
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40 * routines produce a C double from such a string. The suffix (4 or 8)
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41 * specifies the number of bytes in the string.
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42 *
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43 * On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats
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44 * these functions work by copying bits. On other platforms, the formats the
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45 * 4- byte format is identical to the IEEE-754 single precision format, and
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46 * the 8-byte format to the IEEE-754 double precision format, although the
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47 * packing of INFs and NaNs (if such things exist on the platform) isn't
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48 * handled correctly, and attempting to unpack a string containing an IEEE
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49 * INF or NaN will raise an exception.
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50 *
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51 * On non-IEEE platforms with more precision, or larger dynamic range, than
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52 * 754 supports, not all values can be packed; on non-IEEE platforms with less
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53 * precision, or smaller dynamic range, not all values can be unpacked. What
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54 * happens in such cases is partly accidental (alas).
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55 */
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56
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57 /* The pack routines write 4 or 8 bytes, starting at p. le is a bool
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58 * argument, true if you want the string in little-endian format (exponent
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59 * last, at p+3 or p+7), false if you want big-endian format (exponent
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60 * first, at p).
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61 * Return value: 0 if all is OK, -1 if error (and an exception is
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62 * set, most likely OverflowError).
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63 * There are two problems on non-IEEE platforms:
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64 * 1): What this does is undefined if x is a NaN or infinity.
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65 * 2): -0.0 and +0.0 produce the same string.
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66 */
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67 PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
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68 PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
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69
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70 /* Needed for the old way for marshal to store a floating point number.
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71 Returns the string length copied into p, -1 on error.
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72 */
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73 PyAPI_FUNC(int) _PyFloat_Repr(double x, char *p, size_t len);
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74
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75 /* The unpack routines read 4 or 8 bytes, starting at p. le is a bool
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76 * argument, true if the string is in little-endian format (exponent
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77 * last, at p+3 or p+7), false if big-endian (exponent first, at p).
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78 * Return value: The unpacked double. On error, this is -1.0 and
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79 * PyErr_Occurred() is true (and an exception is set, most likely
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80 * OverflowError). Note that on a non-IEEE platform this will refuse
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81 * to unpack a string that represents a NaN or infinity.
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82 */
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83 PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
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84 PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);
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85
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86 #ifdef __cplusplus
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87 }
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88 #endif
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89 #endif /* !Py_FLOATOBJECT_H */