Re: [boost] [parameter] Lazy binding and operator|| patch

From: Daniel Walker (daniel.j.walker_at_[hidden])
Date: 2007-03-21 13:00:00

On 3/20/07, David Abrahams <dave_at_[hidden]> wrote:
>
> on Tue Mar 20 2007, "Daniel Walker" <daniel.j.walker-AT-gmail.com> wrote:
> >
> > template <class Tag, class Default>
> > aux::lazy_default<Tag, lambda::lambda_functor<Default> >
> > operator||(keyword<Tag> const& key,
> >           lambda::lambda_functor<Default> const& default_)
> > {
> >    return key.operator||(default_);
> > }
> >
> > The attached patch implements this. Apply with 'patch -p0 <
> > djw_lazy_binding.patch' from the boost root directory.
>
> Seems like a good idea.  Please submit this to the SF patch tracker.

Thanks! I just submitted it to SF.

> >
> > These errors happen because lazy binding ultimately depends on
> > boost::result_of to deduce the type of the lambda expression, but
> > boost::result_of doesn't handle lambda expressions. This issue can be
> > resolved by applying the two patches I submitted previously.
> >
> > mpl patch: http://tinyurl.com/35x5z5
> > utility patch: http://tinyurl.com/2h3g7n
>
> Please submit those to the tracker, too.

Done. I also submitted a patch for Boost.Lambda per the discussions
here http://tinyurl.com/yr3gc9 and here http://tinyurl.com/2jgtld.

Daniel