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From: Rob Stewart (stewart_at_[hidden])
Date: 2005-03-10 18:05:02

From: "Jonathan Turkanis" <technews_at_[hidden]>
> Oops -- I forgot to finish my overview. Right now I have InputFilter,
> MulticharInputFilter, OutputFilter and MulticharOutputFilter. On top of these
> are built one_step_filter (a convenience class) and symmetric_filter_adapter
> (useful for converting C interfaces).
> I'm thinking I'll promote symmetric_filter_adapter to a full-fledged concept
> SymmetricFilter, and recommend it as the filter concept to use for
> high-performance applications. I'll get rid of the Multichar filters, because
> I've found writing non-blocking Multichar filters to be extremely messy; it's
> just as easy to write a SymmetricFilter in that case.
> So there will be three types of non-blocking filters: InputFilter (renamed
> PullFilter), OutputFilter (renamed PushFilter) and SymmetricFilter. There will
> also be two kinds of filters for beginners: one_step_filter, in which an entire
> document is presented in a vector, and filtered version must be appended to a
> second vector, and stdio_filter, in which the filter reads from std::cin and
> writes to std::cout.
> In the tutorial, I'll analyze each of the current example filters in detail
> (except that the presidential one will just be called dictionary_filter). I'll
> start by showing how to implement the algorithm using a stdio_filter, then I'll
> show how to modify it to implement the more advanced filter concepts.

Sounds great. The reduction in the number of concepts is
valuable. The tutorial progression is a good approach.

Rob Stewart                           stewart_at_[hidden]
Software Engineer           
Susquehanna International Group, LLP  using std::disclaimer;

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