Re: [Boost-users] Using boost::bind with stl algorithms

Subject: Re: [Boost-users] Using boost::bind with stl algorithms
From: Lars Viklund (zao_at_[hidden])
Date: 2010-08-23 13:00:32

On Mon, Aug 23, 2010 at 04:49:58PM +0100, przemyslaw.sliwa_at_[hidden] wrote:
> I have the following question. I have two containers 
> 
> std::set<std::string> insertedEvents;
> std::vector<std::string> eventNames;
> 
> How I would like to copy all those elements from eventNames which are not 
> in insertedEvents. Can this can be done somehow using the boost::bind 
> feature? 

<algorithm> contains std::set_difference, which is most probably what you want,
assuming that eventNames is sorted.

If it's not,

std::remove_copy_if(eventNames.begin(),eventNames.end(),
  std::back_inserter(out),
  boost::bind(&std::set<std::string>::count, boost::cref(insertedEvents), _1)
);

That is, bind the count member function of std::set to your set of
events, and evaluate that for each element in your range.

Of course, something like Phoenix or Lambda would make the predicate
easier on the eyes.

-- 
Lars Viklund | zao_at_[hidden]