Re: [Boost-users] [Range & c++0x Lambdas] Can this be done?

Subject: Re: [Boost-users] [Range & c++0x Lambdas] Can this be done?
From: Nathan Crookston (nathan.crookston_at_[hidden])
Date: 2012-11-21 12:15:18

Rob,

On Wed, Nov 21, 2012 at 6:39 AM, Robert Jones <robertgbjones_at_[hidden]>wrote:

> Can the last line, labelled NOT Ok, be made to work? I think the lambda
> does
> not publish its result as a bind does, so I suspect it's hopeless. Any
> thoughts?
>      // NOT Ok
>     boost::range::push_back( out, in | transformed( []( S & s ) { return
> s.i; } ) );
> }
>
> It seems trivial to have a nested result_type in all cases with a lambda.
However, in C++11 there's no need for it due to decltype.

Sadly, some compilers fall into a gap where result_of (boost or std)
doesn't use decltype and lambdas don't publish tr1-style result_type --
leaving code like the above in the lurch.

Michel Morin wrote some code for adapting such a case which may be of
interest to you: http://lists.boost.org/boost-users/2012/01/72879.php

HTH,
Nate