Re: ffi.cast: weird behaviour
- From: Daurnimator <quae@xxxxxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Thu, 21 Nov 2013 15:34:46 +0100
On 21 November 2013 13:34, Mike Pall <mike-1311@xxxxxxxxxx> wrote:
> Daurnimator wrote:
> > The alternative is to check that the string does not contain an invalid
> NaN
> > upfront: what would this look like?
>
> You check the bit pattern for (any) NaN and always return the
> canonical NaN. The proper check is: exponent is all '1', mantissa
> non-zero, sign ignored.
>
> --Mike
>
Thanks Mike.
This is what I ended up with: https://gist.github.com/daurnimator/7582543
Hopefully I didn't overlook anything else...
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