Re: [Boost-users] A Problem with boost::bind

5 May 2006

      Hossein Haeri wrote:
...
Hi Jeff.
...
...
bind(newPrint, _2, out));
//Error!*/
bind( newPrint, _1, boost::ref(out) );
//untested
Doesn't work! :(
...
I'm not sure why you thought you would use _2?
You mean it starts from 0, and the second argument
should be dealed with _1?
No, the first argument if _1. Your function object's operator():

  ostream& operator ()( const Container& c, ostream& out )const

has only two arguments. And

    bind( newPrint        // instance of function object
        , _1              // placeholder to recieve 
*value_type::const_iterator
        , boost::ref(out) // bound reference to ostream
        )

is as if a function

    ostream& f( const value_type::value_type& _1 )
    {
        print()( _1, out );
    }

is being passed to for_each.

I think your problems lie elsewhere. Try this out with simpler 
non-templated, non-recursive functions first.

Jeff Flinn