Re: [Boost-users] lambda / boost usage questions

From: Darren Cook (darren_at_[hidden])
Date: 2004-02-23 03:44:33

> and I am trying to use lambda to find a song in c which matches a certain 
> artist and title...
> ....
> If I try
> it = find_if(begin(),end(),  boost::bind(&Song::artist,_1)  == "a1"   );
> it fails because "_1" is ambiguos (defined as lambda/placeholder and 
> boost/arg )
> 
> using boost::lambda::bind  (and not including the "normal" bind ) gives a 
> bunch cryptic errors...

That looks correct (but I'm no expert); could it be a problem with using 
"a1" directly? Does something like this work:
   #include <boost/lambda/lambda.hpp>
   #include <boost/lambda/bind.hpp>
   using namespace boost::lambda;

   String a1("a1");
   it = find_if(begin(),end(),  bind(&Song::artist,_1)  == a1 );

> I'd also like to know what's the difference between boost::bind and 
> boost::lambda::bind ?

My understanding was the boost::lambda is a superset of bind functionality, 
so if the lambda library works on your compiler then you should use that.

Darren