Re: [boost] [Bind] How do I get bind to deduce the return type of for_each?

Subject: Re: [boost] [Bind] How do I get bind to deduce the return type of for_each?
From: Roland Bock (rbock_at_[hidden])
Date: 2010-04-17 08:58:53

Daniel Walker wrote:
> On Sat, Apr 17, 2010 at 7:25 AM, Roland Bock <rbock_at_[hidden]> wrote:
>   
>> Thomas Jordan wrote:
>>     
>>> [snip]
>>> Thanks for the suggestion, Roland, I am sure you could get something like
>>> this to work easily enough.  However, if I understand correctly your
>>> suggestion involves defining a separate functor  - myClass - to take the
>>> vocType's, and which I guess wraps the inner call to for_each.  I had hoped
>>> for a more generic solution which doesn't involve the creation of new
>>> functors.  I was hoping I could accomplish the objective of passing an
>>> algorithm into an algorithm jgenerically, just doing everything at point of
>>> call using just Boost.bind, the std::algorithms (wrapped) and using if
>>> necessary some boost.function functors to help type deduction.  Are we
>>> saying this isn't possible?
>>>
>>>       
>> Hi Thomas,
>>
>> we don't say it isn't possible :-)
>>
>> Here you go:
>>
>>     
> <snip>
>   
>>  for_each(vov.begin(), vov.end(),
>>        bind(for_each< vocType::iterator, function<void (myClass&)> >,
>>           bind<vocType::iterator>(&vocType::begin, _1),
>>           bind<vocType::iterator>(&vocType::end, _1),
>>           protect(bind(&myClass::func, _1))
>>           )
>>        );
>>     
>
> Oh yeah, that's a good idea! Instantiate std::for_each with a void
> boost::function! That's a portable solution as well, since bind and
> function are available on practically any compiler, even ancient,
> substandard ones.
>
> Daniel Walker
>
>   

Thanks :-)

Btw, could I do the same with tr1::bind? What would be the equivalent of 
boost::protect?

Regards,

Roland