Re: [boost] [phoenix] default constructable stateless lambdas

Subject: Re: [boost] [phoenix] default constructable stateless lambdas
From: Thomas Heller (thom.heller_at_[hidden])
Date: 2012-09-25 01:50:45

On Tuesday, September 25, 2012 07:56:49 Joel de Guzman wrote:
> On 9/25/12 3:01 AM, Eric Niebler wrote:
> > While answering a question about Phoenix on stackoverflow[^1], I
> > discovered that Phoenix lambda types are default-constructable, so long
> > as all the terminals are also default constructable. That's handy when
> > the terminals are stateless. Can it (the default-constructability) be
> > relied on? It doesn't appear to be documented.
> 
> Phoenix-2 required that:
>    http://tinyurl.com/c2y8q2z
> 
> It seems to have been lost in Phoenix-3:
>    http://tinyurl.com/92fxbze
> 
> I think it should be reinstated.
*nod*

 
> > C++11 lambdas have the nice property that stateless ones are implicitly
> > convertible to raw function pointers. This can be implemented for
> > Phoenix if we can rely on the default-constructability of Phoenix lambda
> > types. In my stackoverflow answer I show how. It'd be pretty cool if
> > this were a standard part of all Phoenix lambdas. Is there interest?
> > 
> > Incidentally, I think it's really, really cool that Phoenix allows this
> > kind of extensibility. It's a very nice example of the benefits of the
> > introspection capabilities built into Phoenix. Perhaps this could be
> > worked into the docs somehow?
> > 
> > [^1]:
> > http://stackoverflow.com/questions/10144948/static-functions-from-boost-la
> > mbda-or-boost-phoenix/12326204#12326204
> Most definitely!

Woah. this is insanely cool! Let's have it I say!
(I'd say feel free to commit the changes and drop us a note when you are done)
> 
> Regards,