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Issue #8817: Expose round-to-nearest variant of divmod in _PyLong_Divmod_Near

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for use by the datetime module; also refactor long_round to use this function.
This commit is contained in:
Mark Dickinson 2010-05-26 16:02:59 +00:00
parent e73b21240a
commit 7f1bf8004d
2 changed files with 149 additions and 112 deletions
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8
Include/longobject.h
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@ -101,6 +101,14 @@ PyAPI_FUNC(int) _PyLong_Sign(PyObject *v);
*/
PyAPI_FUNC(size_t) _PyLong_NumBits(PyObject *v);
/* _PyLong_Divmod_Near. Given integers a and b, compute the nearest
integer q to the exact quotient a / b, rounding to the nearest even integer
in the case of a tie. Return (q, r), where r = a - q*b. The remainder r
will satisfy abs(r) <= abs(b)/2, with equality possible only if q is
even.
*/
PyAPI_FUNC(PyObject *) _PyLong_Divmod_Near(PyObject *, PyObject *);
/* _PyLong_FromByteArray: View the n unsigned bytes as a binary integer in
base 256, and return a Python long with the same numeric value.
If n is 0, the integer is 0. Else: