[vector] #88: Add mapMaybe and catMaybes

[vector]

#88: Add mapMaybe and catMaybes
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Reporter:  akio         |       Owner:     
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:     
 Version:               |    Keywords:     
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 I often want to use a vector analogue of mapMaybe from Data.Maybe. Working
 around it is typically awkward because it requires a use of fromJust.

 I'll attach a patch that implements mapMaybe and a related function,
 catMaybes.

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Ticket URL: <http://trac.haskell.org/vector/ticket/88>
vector <http://trac.haskell.org/vector>
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