Add popCount to Data.Bits
Now when we have a fast popCnt#
primop it would be nice to expose it to the world through an official API. I propose we add this method to the Bits
class in Data.Bits
:
-- | Return the number of set bits in the argument, know as the
-- population count or the Hamming weight.
popCount :: a -> Int
The proposal was discussed and agreed upon in this thread: http://thread.gmane.org/gmane.comp.lang.haskell.libraries/16073
Trac metadata
Trac field | Value |
---|---|
Version | 7.2.1 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
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