From: Permjacov Evgeniy <permea...@gmail.com> > > Hi. I Wrote a simple iteration library. It was not intensively tested, > so it MAY contatin bugs, but it is very unlikely. The library is > currently on github: https://github.com/permeakra/iteration > > I'm not ready to upload it to hackage, as some testing and extension is > really needed. However, I'd like to know about possible flaws. > > Current goal is addition of byte-stream (de)compression and IO functions > extenstion. After this package will be cabalized and uploaded to > hackage. So, while design is not frozen yet, I'm interested in criticism > -)/ >
First, I haven't examined your code in sufficient depth to fully understand it, so I may be off the mark with this comment. However, I'm not convinced it's possible to safely implement zipping in iteration-style IO without another technique (e.g. monadic regions), by which I mean I suspect any code which exposes enough control to pause an enumeration (or alternatively allows a user-supplied termination check to the enumerator) will also not provide guaranteed finalization/garbage collection of the underlying resource (e.g. handle). I also require zipping of streams, and in fact it is possible with iteratee. I haven't included the code in the library because I was formerly not convinced of its safety. I do think it's safe now, but only by use of a monadic region. John
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