On 28 August 2012 19:26, Simon Peyton-Jones <simonpj@microsoft.com> wrote:Admittedly, my quick sample of those packages makes it seem like they
only use primitive _for_ dealing with vector (as in all the packages I
looked at also had vector as a dep).

I use primitive for its MutableArray directly inside the hashtables package if the bounds checking is turned off (the default): https://github.com/gregorycollins/hashtables/blob/master/src/Data/HashTable/Internal/Array.hs, and also for MutableByteArray: https://github.com/gregorycollins/hashtables/blob/master/src/Data/HashTable/Internal/IntArray.hs

The types from primitive have less overhead than vector, which is important for some of my use cases.