lib for tuples

[Christian Höner zu Siederdissen]

That would not be economical. Lets just say people never use more than
8-tuple and then try to count how many functions you would need.

The "tuple" package on Haskell provides a generic interface to
access/manipulate the k'th element of an n-tuple. That should be
sufficient and is not subject to combinatorical explosion (well the
instance are a bit).

Gruss,
Christian

* Serge D. Mechveliani <mechvel at botik.ru> [04.01.2011 11:29]:
> People,
> I define, for example, 
>   tuple42    (_, y, _, _)   = y,
>   setTuple42 (x, _, z, u) y = (x, y, z, u),
>   mapTuple42 f (x, y, z, u) = (x, f y, z, u).
> 
> But it looks natural to have such functions for tuples in the library.
> As Haskell-2010 has  zip3, zip4 ...,  where are the library functions
> tupleij, setTupleij, mapTupleij,  say, for  i, j <- [2 .. 6]
> ?
> I expected to find in the Report "Data.Tuple" similar as "Data.List",
> but do not.
> GHC has "Data.Tuple", but it misses the above functions.
> 
> Thank you in advance for your comments,
> 
> -----------------
> Serge Mechveliani
> mechvel at botik.ru
> 
> 
> 
> 
> 
> 
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