Mercurial > cpython-lru_cache-weakref
view Include/floatobject.h @ 19283:b865cd5c1925 legacy-trunk
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 |
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/* Float object interface */ /* PyFloatObject represents a (double precision) floating point number. */ #ifndef Py_FLOATOBJECT_H #define Py_FLOATOBJECT_H #ifdef __cplusplus extern "C" { #endif typedef struct { PyObject_HEAD double ob_fval; } PyFloatObject; extern DL_IMPORT(PyTypeObject) PyFloat_Type; #define PyFloat_Check(op) ((op)->ob_type == &PyFloat_Type) /* Return Python float from string PyObject. Second argument ignored on input, and, if non-NULL, NULL is stored into *junk (this tried to serve a purpose once but can't be made to work as intended). */ extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char** junk); /* Return Python float from C double. */ extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double); /* Extract C double from Python float. The macro version trades safety for speed. */ extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *); #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval) /* Write repr(v) into the char buffer argument, followed by null byte. The buffer must be "big enough"; >= 100 is very safe. PyFloat_AsReprString(buf, x) strives to print enough digits so that PyFloat_FromString(buf) then reproduces x exactly. */ extern DL_IMPORT(void) PyFloat_AsReprString(char*, PyFloatObject *v); /* Write str(v) into the char buffer argument, followed by null byte. The buffer must be "big enough"; >= 100 is very safe. Note that it's unusual to be able to get back the float you started with from PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to preserve precision across conversions. */ extern DL_IMPORT(void) PyFloat_AsString(char*, PyFloatObject *v); #ifdef __cplusplus } #endif #endif /* !Py_FLOATOBJECT_H */
