mirror of https://github.com/python/cpython
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
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/* Float object interface */
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/*
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PyFloatObject represents a (double precision) floating point number.
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*/
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#ifndef Py_FLOATOBJECT_H
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#define Py_FLOATOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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PyObject_HEAD
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double ob_fval;
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} PyFloatObject;
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PyAPI_DATA(PyTypeObject) PyFloat_Type;
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#define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)
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#define PyFloat_CheckExact(op) ((op)->ob_type == &PyFloat_Type)
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/* Return Python float from string PyObject. Second argument ignored on
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input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
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purpose once but can't be made to work as intended). */
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PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*, char** junk);
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/* Return Python float from C double. */
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PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
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/* Extract C double from Python float. The macro version trades safety for
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speed. */
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PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
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#define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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/* Write repr(v) into the char buffer argument, followed by null byte. The
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buffer must be "big enough"; >= 100 is very safe.
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PyFloat_AsReprString(buf, x) strives to print enough digits so that
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PyFloat_FromString(buf) then reproduces x exactly. */
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PyAPI_FUNC(void) PyFloat_AsReprString(char*, PyFloatObject *v);
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/* Write str(v) into the char buffer argument, followed by null byte. The
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buffer must be "big enough"; >= 100 is very safe. Note that it's
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unusual to be able to get back the float you started with from
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PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
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preserve precision across conversions. */
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PyAPI_FUNC(void) PyFloat_AsString(char*, PyFloatObject *v);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_FLOATOBJECT_H */
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