Subject: Re: [boost] [Bind] How do I get bind to deduce the return type of for_each?
From: Daniel Walker (daniel.j.walker_at_[hidden])
Date: 2010-04-17 08:30:50
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