Re: [Boost-users] [review] Dataflow Review starts today, September 1st

From: Manuel Jung (gzahl_at_[hidden])
Date: 2008-09-02 12:36:32

Stjepan Rajko wrote:
Hey,

> Hi Manuel,
> 
> On Tue, Sep 2, 2008 at 8:48 AM, Manuel Jung <gzahl_at_[hidden]> wrote:
>>
>> Hey,
>>
>> The filter of the GIl example is always processed, whether or whether not
>> it is multiplexed to the output, right? Maybe it would be good to insert
>> a conditional component right before the filter, therefore the data is
>> dropped, if the multiplexer takes data from slot 0. Otherwise a senseless
>> computation is done, if the filter is turned off.
>>
> 
> This is correct.
> 
>> I wanted to alter the example as suggested, but i don't know how to use
>> the conditional component? I couldn't find a example for that. Maybe you
>> could point out how to use it.
>>
> 
> The conditional component is a generic component that is used to make
> other components.  As such, it wouldn't serve the purpose you need out
> of the box.  But the junction component would:
> 
>
http://www.dancinghacker.com/code/dataflow/dataflow/signals/components/flow/junction.html
> 
> That particular page doesn't mention it (although the example
> demonstrates it), but junction also has gate functionality (it's
> mentioned in the component summary).  Actually, "gate" would probably
> be a better name for this component.

Ah, yes, i read the junction page, even opened it through the conditional
page, but missed it. And i agree, "gate" would be a better name!

> 
> Incidentally, junction is implemented using the conditional component like
> this:
>
http://svn.boost.org/trac/boost/browser/sandbox/SOC/2007/signals/boost/dataflow/signals/component/junction.hpp
> 
> Best,
> 
> Stjepan

Kind regards
Manuel

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