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persistent-vector-0.1.0.1: A persistent sequence based on array mapped tries

The persistent-vector package

This package provides persistent vectors based on array mapped tries. The implementation is based on the persistent vectors used in clojure, but in a Haskell-style API. The API is modeled after Data.Sequence from the containers library.

Technically, the element-wise operations are O(log(n)), but the underlying tree cannot be more than 7 or 8 levels deep so this is effectively constant time.

One change from the clojure implementation is that this version supports O(1) slicing, though it does cheat a little. Slices retain references to elements that cannot be indexed. These extra references (and the space they occupy) can be reclaimed by shrinking the slice. This seems like a reasonable tradeoff, and, I believe, mirrors the behavior of the vector library.

Highlights:

• O(1) append element, indexing, updates, length, and slicing

• Reasonably compact representation

Properties

Modules

Downloads

• persistent-vector-0.1.0.1.tar.gz (Cabal source package)
• package description (included in the package)

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