On 04/02/2012 09:52 AM, Sven Bauhan wrote:
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. The problem is that boost::posix_time::time_period::contains is overloaded. Thus the compiler can not decide which function address you mean. The solution I usually go with is the following:
bool (boost::posix_time::time_period::*f)(boost::posix_time::time_period const &) const = &boost::posix_time::time_period::contains; or: bool (boost::posix_time::time_period::*f)(boost::posix_time::ptime const &) const = &boost::posix_time::time_period::contains; Depending on what type time_ actually is ... and then continue with: LightningQueue::const_iterator l = std::find_if( m_lightnings.begin(), m_lightnings.end(), bind(f, ll::bind(&LightningSlice::timeslice, ll::_1 ), time_ ) );
Greetings, Sven _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users