[vector] #24: Conversion between different types of vectors

vector vector at projects.haskell.org
Tue Jun 15 02:09:06 EDT 2010

#24: Conversion between different types of vectors
Reporter:  Khudyakov    |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  major        |    Milestone:     
 Version:               |   Resolution:     
Keywords:               |  
Comment (by rl):

 Actually, the darcs version includes this:

 convert :: (Vector v a, Vector w a) => v a -> w a

 This is an O(n) function, however. I agree that O(1) conversions between
 unboxed and storable vectors would be very desirable. This would require
 basing Data.Vector.Unboxed on Data.Vector.Storable instead of
 Data.Vector.Primitive, though. I've been thinking about that for a while
 but currently, GHC doesn't optimise storable vectors as well as primitive
 ones in some cases. In particular, see
 http://hackage.haskell.org/trac/ghc/ticket/4096. I'll try to get these
 primitives into GHC 6.14 but that means that storable-unboxed conversions
 won't be O(1) at least as long as 6.12 is widely used.

Ticket URL: <http://trac.haskell.org/vector/ticket/24#comment:2>
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