[Haskell-cafe] containers license issue

[Clark Gaebel]

I just did a quick derivation from
http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2 to get
the highest bit mask, and did not reference FXT nor the containers
implementation. Here is my code:

highestBitMask :: Word64 -> Word64
highestBitMask x1 = let x2 = x1 .|. x1 `shiftR` 1
                        x3 = x2 .|. x2 `shiftR` 2
                        x4 = x3 .|. x3 `shiftR` 4
                        x5 = x4 .|. x4 `shiftR` 8
                        x6 = x5 .|. x5 `shiftR` 16
                        x7 = x6 .|. x6 `shiftR` 32
                     in x7 `xor` (x7 `shiftR` 1)

This code is hereby released into the public domain. Problem solved.

  - Clark


On Wed, Dec 12, 2012 at 12:23 PM, Mike Meyer <mwm at mired.org> wrote:

> Niklas Larsson <metaniklas at gmail.com> wrote:
> >2012/12/12 Niklas Larsson <metaniklas at gmail.com>:
> >>
> >> There is no copied code from FXT (which can be said with certainty as
> >> FXT is a C library), hence the there can be copyright issue.
> >Gah, I should proofread! NO copyright issue, of course.
>
> Um, no. Copyright *includes* translations. A translated copy of a work is
> based on the original and requires copyright permissions. This makes it a
> modified work according to the definitions in the GPL.
>
> You're all thinking about this as if logic and the law had something in
> common. The relevant question isn't  whether or not the GPL applies, but
> whether or not a case can be made that the GPL should apply. Clearly, that
> case can be made, so if you include the containers code without treating it
> as GPL'ed, you risk winding up in court. I suspect that's what the lawyer
> is really trying to avoid, as it would mean they'd actually have to work.
> --
> Sent from my Android tablet with K-9 Mail. Please excuse my swyping.
>
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