Re: [boost] Active objects?

From: Thorsten Schuett (schuett_at_[hidden])
Date: 2005-11-02 04:22:30

On Wednesday 02 November 2005 09:36, Reece Dunn wrote:
> Thorsten Schuett wrote:
> > On Tuesday 01 November 2005 20:11, Peter Dimov wrote:
> > [snip]
> >
> >>>However, the active lambda stuff could possibly be done as an
> >>>extension of Boost.Lambda using Spirit/Phoenix sugar:
> >>>
> >>>  future< int > = active<>[ _1 = _1 + 2 ];
> >>
> >>This doesn't work; your active<> doesn't take any arguments, so you can't
> >>use _1. It is possible to make this:
> >>
> >>future<int> f1 = active( bind( f, 1, 2 ) );
> >>future<int> f2 = active( bind( &X::f, &x, 1, 2 ) );
> >
> > What is the point of adding the active-Wrapper? The bind already returns
> > a nullary function.
> >
> > future<int> f1 = bind( f, 1, 2 );
> >
> > should be sufficient.
> >
> > Just wondering.
>
> I suppose you could make future take a bind/function and then make that
> run on a thread. One of Herb's points was that you could grep for
> *active* to find the places where you gain concurrency and for *wait*
> where you lose it. For example:
>
>     future< int > val = active { ... } // gain concurrency
>     // ...
>     std::cout << "value = " << val.wait(); // lose concurrency
I watched his presentation yesterday and I don't really buy this argument. MS 
is selling IDEs. It shouldn't be that hard to extend the search dialog to 
allow the user to express "complex queries" on the source code.

- Find all const functions in template classes
- Find all "gain concurrency" points
- Find all "lose concurrency" points

IMHO, the "active" keyword is redundant.

Thorsten