Mercurial > cpython-lru_cache-weakref

annotate Include/floatobject.h @ 19283:b865cd5c1925 legacy-trunk

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Added comments before recently added/assigned slots in the type object, so the backward compatibility issues will be easier to understand. I only added comments indicating additions and assignments back to Python 2.0.
author Fred Drake <fdrake@acm.org>
date Wed, 15 Aug 2001 18:32:33 +0000
parents fe4c1034b480
children 19d271f297dc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2 /* Float object interface */
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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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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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19 extern DL_IMPORT(PyTypeObject) PyFloat_Type;
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21 #define PyFloat_Check(op) ((op)->ob_type == &PyFloat_Type)
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23 /* Return Python float from string PyObject. Second argument ignored on
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24 input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
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25 purpose once but can't be made to work as intended). */
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26 extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char** junk);
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28 /* Return Python float from C double. */
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29 extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double);
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31 /* Extract C double from Python float. The macro version trades safety for
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32 speed. */
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33 extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *);
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34 #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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36 /* Write repr(v) into the char buffer argument, followed by null byte. The
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37 buffer must be "big enough"; >= 100 is very safe.
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38 PyFloat_AsReprString(buf, x) strives to print enough digits so that
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39 PyFloat_FromString(buf) then reproduces x exactly. */
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40 extern DL_IMPORT(void) PyFloat_AsReprString(char*, PyFloatObject *v);
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42 /* Write str(v) into the char buffer argument, followed by null byte. The
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43 buffer must be "big enough"; >= 100 is very safe. Note that it's
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44 unusual to be able to get back the float you started with from
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45 PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
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46 preserve precision across conversions. */
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47 extern DL_IMPORT(void) PyFloat_AsString(char*, PyFloatObject *v);
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49 #ifdef __cplusplus
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50 }
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51 #endif
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52 #endif /* !Py_FLOATOBJECT_H */