StorableWrap is useless

[vagarenko]

Am I missing something?
Isn't this instance:

instance (Storable a) => CStorable (StorableWrap a)

completly useless?
Why would I want CStorable if I already have Storable?
It should be other way round:

instance(Generic a, CStorable (Rep a)) => Storable (StorableWrap a)

so I could derive Generic instance for my type, wrap it with StorableWrap and feed it to some function that takes Storable.

[vagarenko]

Take a look at https://hackage.haskell.org/package/generic-storable

[maurer]

StorableWrap is meant for use with functions which consume something belonging to the typeclass CStorable, when people want a shortcut for using a Storable object instead.

e.g.

f :: (CStorable a) -> IO ()
f (StorableWrap somethingStorable)

If you want something the other way around as well, feel free to write it and submit a PR, but this codepath is not useless, it is actually in use.