Re: [Boost-users] [lambda]

Subject: Re: [Boost-users] [lambda]
From: Marcin Zalewski (marcin.zalewski_at_[hidden])
Date: 2010-02-26 10:53:24

Steven,

Thanks for pointing that out. I tried a quick search for the problem,
but I used wrong keywords apparently.

Cheers,
-m

On Fri, Feb 26, 2010 at 10:36, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> AMDG
>
> Marcin Zalewski wrote:
>>
>> I am trying to use lambda's constructor [1] with fusion's fused [2].
>> Fused requires that the function object passed to it has a following
>> valid expression:
>>
>> Â boost::result_of< F(T1 Â ...TN) >::type
>>
>> Unfortunately, constructor does not support result_of. Its
>> implementation contains the following piece of code:
>>
>> template <class U> struct sig { typedef T type; };
>>
>> This happens to be exactly what's necessary for constructor to support
>> result_of, but sig would have to be renamed to result.
>>
>> I guess I do not really have a question here but rather a request to
>> make constructor compatible with result_of. There seems to be no
>> reason not to do it, and I could not figure out a much nicer way to
>> construct objects with fusion sequences than combining lambda's
>> constructor and fusion's fused. It comes so close, but if only sig was
>> result...
>>
>
> The problem is that Lambda came before result_of.
> See also https://svn.boost.org/trac/boost/ticket/864
>
> In Christ,
> Steven Watanabe
>
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