Re: [Boost-users] Lambda and placeholders

Subject: Re: [Boost-users] Lambda and placeholders
From: ivan.lelann_at_[hidden]
Date: 2012-04-02 04:01:57

----- Mail original -----
> De: "Sven Bauhan" <sven.bauhan_at_[hidden]>
> À: boost-users_at_[hidden]
> Envoyé: Lundi 2 Avril 2012 09:52:38
> Objet: Re: [Boost-users] Lambda and placeholders
> 
> 
> > namespace ll = boost::lambda;
> > ... = std::find_if(..., ll::bind(&Timeslice::contains,
> >  ll::bind(&LightningSlice::timeslice, ll::_1), time_));
> > 
> > Yes, it's ugly. Unfortunately, you can't really improve on it.
> > 
> > Sebastian
> > _______________________________________________
> 
> Thanks,
> 
> I tried this suggestion:
> 
> #include <boost/lambda/bind.hpp>
> namespace ll = boost::lambda;
> 
> 	LightningQueue::const_iterator l
> 		= std::find_if( m_lightnings.begin(), m_lightnings.end(),
> 				bind( &boost::posix_time::time_period::contains,
> 				ll::bind( &LightningSlice::timeslice, ll::_1 ), time_
> 			) );
> 
> But then I got this error message:
> 

"error: no matching function for call to 'bind'"

Your first "bind" is not "ll::"-prefixed.

Regards,
Ivan

> 
> ../LightningIndex.cpp: In member function 'weather::LightningSlice
> weather::LightningIndex::getLightningSlice(boost::posix_time::ptime)':
> ../LightningIndex.cpp:40: error: no matching function for call to
> 'bind(<unresolved overloaded function type>, const
> boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<2,
> boost::lambda::function_action<2, boost::lambda::detail::unspecified>
> >,
> boost::tuples::tuple<const boost::posix_time::time_period&
> (weather::LightningSlice::* const)()const, const
> boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,
> boost::tuples::null_type, boost::tuples::null_type,
> boost::tuples::null_type,
> boost::tuples::null_type, boost::tuples::null_type,
> boost::tuples::null_type,
> boost::tuples::null_type, boost::tuples::null_type> > >,
> boost::posix_time::ptime&)'
> 
> This is even more confusion than the first error message.
> 
> Greetings, Sven
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