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Monthly Downloads: 73
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Data     Compact    
Latest version: v0.2.0.1

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README

compact-word-vectors

This a (GHC) Haskell library, which implements a data structure designed to store vectors of small integers with minimal memory overhead.

For vectors of non-negative integers, see the module WordVec; for signed integers (which is a bit slower) see IntVec. The underlying raw binary storage is implemented in Blob.

For example the list [1..14] :: [Int] consumes 560 bytes (70 words) on a 64 bit machine, while the corresponding WordVec takes only 16 bytes (2 words), and the one corresponding to [101..115] still only 24 bytes (3 words).

Unboxed arrays (UArray) or unboxed vectors (Data.Vector.Unboxed) are better than lists, as they only have a constant overhead, but those constants are big: 13 words (104 bytes on 64 bit) for unboxed arrays, and 6 words (48 bytes) for unboxed vectors. And you still have to select the number of bits per element in advance.

Installation

It's on Hackage: https://hackage.haskell.org/package/compact-word-vectors So you can install it using cabal:

$ cabal update
$ cabal install --lib compact-word-vectors