Re: [Boost-users] [bind] How do I....?

Subject: Re: [Boost-users] [bind] How do I....?
From: Michael Caisse (boost_at_[hidden])
Date: 2009-08-18 13:10:25

Robert Jones wrote:
> 2009/8/18 Björn Karlsson <Bjorn.Karlsson_at_[hidden] 
> <mailto:Bjorn.Karlsson_at_[hidden]>>
>
>
>
>     2) Use Boost.Lambda's bind() and dereference the placeholder
>     directly in the bind expression.
>
>      for_each(vec.begin(), vec.end(), bind(&foo, *_1)); 
>
>
> Much as I like Lambda for virgin code, in my work code base there's a 
> very visible inclusion
> of Boost.Bind, with placeholders in the global namespace. I've 
> concluded that the pain of clashing
> placeholders just isn't worth it, so I steer clear of Lambda now.
>
> Thanks Bjorn.
>
>  - Rob.

Rob -

Let me suggest Boost.Phoenix. Phoenix is an amazingly powerful library that will
handle all of your bind and lambda needs. You also wont suffer from the plagued
global namespace fiasco by mixing Boost.Bind and Boost.Lambda.

Your example with Phoenix:

#include <vector>
#include <algorithm>
#include <boost/shared_ptr.hpp>
#include <boost/spirit/home/phoenix/core.hpp>
#include <boost/spirit/home/phoenix/operator.hpp>
#include <boost/spirit/home/phoenix/bind/bind_function.hpp>

struct A {};

void foo( const A& ) {}

int main()
{
   using namespace boost::phoenix;
   using namespace boost::phoenix::arg_names;

   std::vector< boost::shared_ptr< A > > vec;
   vec.push_back( boost::shared_ptr< A >( new A ) );

   std::for_each( vec.begin(), vec.end(),
                  bind( &foo, *arg1 ) );
   return 0;
}

I hope this helps out.

Best Regards -
Michael

-- 
----------------------------------
Michael Caisse
Object Modeling Designs
www.objectmodelingdesigns.com