[Haskell-cafe] arr f

[Sven Biedermann]

Dear Haskellers,
 
since this is my first post, 
 
    "Hello all"
 
I have a problem with a function taken from class Arrow.
 
    arr :: (b -> c) -> a b c
 
To build my own arrow, i need to distinguish between different kinds of
b or c.
For instance, if b has the form (d,e), i want to construct something
different as when having form (d,e,f).
 
Could I get a hint how to express my needs, please!
 
Many thanks in advance
 
 
Sven Biedermann
 
 
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