Mark Dickinson <dicki...@gmail.com> added the comment:

I don't think this change should be made for 2.7 or 3.2, since it has potential 
to break existing code.

Though technically, conversion of an out-of-range double to a float gives 
undefined behaviour (C99 6.3.1.5p2), I'm willing to bet that most current 
compilers just happily return +-infinity in these cases, and there's probably 
code out there that would break if we changed this.

So for 2.7 or 3.2, we could just return +-inf here instead.  Though even that 
isn't quite right if you're picky about corner cases, since there are some 
values *just* outside [-FLOAT_MAX, FLOAT_MAX] that should still round to 
+-FLOAT_MAX under round-to-nearest.

I suggest leaving this alone for 2.7 and 3.2

For 3.3, it's not clear to me whether it's better to return +-inf or to raise 
here.

----------
nosy: +mark.dickinson

_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14722>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe: 
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com

Reply via email to