[Haskell-cafe] Storable types with zero size
carter.schonwald at gmail.com
Sat Dec 19 20:04:10 UTC 2015
Ohhhh. I see. I guess the funny bit is that the size of a strictly
evaluated unit type should be zero. So size zero is what I was thinking
On Saturday, December 19, 2015, Douglas McClean <douglas.mcclean at gmail.com>
> My thinking was that an address p is valid for a type a iff p `mod`
> (alignment (undefined :: a)) == 0 and that, at least in most languages, x
> mod 0 is undefined. In contrast, anything mod 1 is 0.
> On Dec 19, 2015 10:01 AM, "Carter Schonwald" <carter.schonwald at gmail.com
>> 1 byte alignment might be tricky.
>> When talking about storable, its helpful to keep in mind that it's meant
>> to facilitate c interop, and ask what the corresponds with unit in c land,
>> and I think the answer is 0 bits :)
>> On Friday, December 18, 2015, Douglas McClean <douglas.mcclean at gmail.com
>>> Can the sizeOf a Storable type be 0?
>>> As far as I can see the documentation doesn't say. I wouldn't expect
>>> there to be a problem, but there also isn't an instance Storable (), which
>>> I was expecting to see.
>>> If so, should its alignment be 1 or 0?
>>> -Doug McClean
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