Re: [Boost-users] Lambda and placeholders

Subject: Re: [Boost-users] Lambda and placeholders
From: Sven Bauhan (sven.bauhan_at_[hidden])
Date: 2012-04-02 03:52:38

> 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:

../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