Implement `calloc{,Bytes,Array,Array0}` allocators

[Oleksandr Petrov]

Hi everyone,

There is a proposal [1] (with implemented revision) to implement
zero-initialising
versions
of malloc{,Bytes,Array,Array0}

   - Add calloc and callocBytes to Foreign.Marshal.Alloc.
   - Add callocArray and callocArray0 to Foreign.Marshal.Array.

The benefit is that you can allocate required amount of memory and be
certain that it will be cleared
(set with zeroes) before you use it. Original discussion took a place in
`fillBytes` [1] and was
publicised on that mailing list [2].

Please share your thoughts.

Thank you.

[1] https://phabricator.haskell.org/D527
[2] https://phabricator.haskell.org/D461#11541
[3] https://www.haskell.org/pipermail/libraries/2014-November/024251.html




-- 
alex p
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