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

18 Aug 2009

      Robert Jones wrote:
...
2009/8/18 Björn Karlsson mailto:Bjorn.Karlsson@readsoft.com>
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 
#include 
#include 
#include 

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

-- 

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Michael Caisse
Object Modeling Designs
www.objectmodelingdesigns.com