Mercurial > cpython-lru_cache-weakref

annotate Include/floatobject.h @ 20737:00a581bdedeb legacy-trunk

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When overriding __str__ or __repr__, set the tp_print slot to NULL.
author Guido van Rossum <guido@python.org>
date Mon, 29 Oct 2001 14:33:44 +0000
parents 10f5927dbf05
children c1eb668525e1
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853b736a6a9e Added copyright notice.
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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) PyObject_TypeCheck(op, &PyFloat_Type)
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22 #define PyFloat_CheckExact(op) ((op)->ob_type == &PyFloat_Type)
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24 /* Return Python float from string PyObject. Second argument ignored on
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25 input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
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26 purpose once but can't be made to work as intended). */
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27 extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char** junk);
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29 /* Return Python float from C double. */
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30 extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double);
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32 /* Extract C double from Python float. The macro version trades safety for
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33 speed. */
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34 extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *);
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35 #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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37 /* Write repr(v) into the char buffer argument, followed by null byte. The
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38 buffer must be "big enough"; >= 100 is very safe.
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39 PyFloat_AsReprString(buf, x) strives to print enough digits so that
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40 PyFloat_FromString(buf) then reproduces x exactly. */
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41 extern DL_IMPORT(void) PyFloat_AsReprString(char*, PyFloatObject *v);
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42
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43 /* Write str(v) into the char buffer argument, followed by null byte. The
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44 buffer must be "big enough"; >= 100 is very safe. Note that it's
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45 unusual to be able to get back the float you started with from
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46 PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
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47 preserve precision across conversions. */
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48 extern DL_IMPORT(void) PyFloat_AsString(char*, PyFloatObject *v);
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50 #ifdef __cplusplus
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51 }
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52 #endif
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53 #endif /* !Py_FLOATOBJECT_H */