[Haskell-cafe] Creating a instance for (Storable Text)

[Chris Wong]

Since Text is represented as UTF-16 underneath, you can retrieve the
length in terms of 16-bit code units.

I don't think you'll be able to mmap them though, since the backing
array may be moved by the garbage collector.

See https://hackage.haskell.org/package/text-1.2.2.1/docs/Data-Text-Foreign.html

On Fri, Nov 25, 2016 at 7:20 AM, Cody Goodman
<codygman.consulting at gmail.com> wrote:
> Any ideas on how I'd write this instance? I know for it to be storable it
> needs a size, couldn't I just get the length of the text? Has anyone did
> anything similar?
>
> I ran into a surprise when trying to use storable-record and derive-storable
> and tried using them with a record that contained a Text field.
>
> My end goal is having a vector of records that could contain Text, UTCTime,
> or other similarly complex types which I can write as an mmap to disk and
> then read back to the original format.
>
> Thanks!
>
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-- 
Chris Wong (https://lambda.xyz)

"I had not the vaguest idea what this meant and when I could not
remember the words, my tutor threw the book at my head, which did not
stimulate my intellect in any way." -- Bertrand Russell