Boost Users :
From: David Abrahams (dave_at_[hidden])
Date: 2005-07-06 13:09:38
Zeljko Vrba <zvrba_at_[hidden]> writes:
> David Abrahams wrote:
> | like this one. If you can condense it into a simple statement, I'm
> | willing to try again, but otherwise I'm not sure I can help you.
> Think UNIX pipelines: ls -l | sort | gzip > /tmp/blah
> 1 stage == one operation over the data. ls is provider fo sort which is
> provider to gzip.
> i want to mimick the same in C++. each stage consumes data until its
> provider has some, does some processing on the data and feeds the result
> to its consumer (but only when its consumer asks it to provide the data
> - the model is consumer-driven).
> but I need more powerful semantic: each stage can have more than one
> input, it can feed its output to more than one stage and types on input
> and output may differ.
> is it a bit clearer now?
Seems like you want to build a dataflow machine at compile-time. It's
a nontrivial problem because, among other things -- since you may have
multiple consumers for any piece of data -- you have to buffer
results. There aren't any simple answers, AFAICT.
If you have a specific question, I can try to answer, but solving the
whole design problem is beyond my capacity in my "free" time.
-- Dave Abrahams Boost Consulting www.boost-consulting.com
Boost-users list run by williamkempf at hotmail.com, kalb at libertysoft.com, bjorn.karlsson at readsoft.com, gregod at cs.rpi.edu, wekempf at cox.net