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

Subject: Re: [Boost-users] [Range & c++0x Lambdas] Can this be done?
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2012-11-21 12:53:27

On Wed, Nov 21, 2012 at 5:15 PM, Nathan Crookston <
nathan.crookston_at_[hidden]> wrote:

> 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
>
>
Right, thank you for that informative explanation. So, several solutions,
non perfect. Choose
your poison!

- Rob.