Re: [Boost-users] composing with boost::bind

From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-07-11 11:04:28

Pieter Op de Beeck wrote:
> Hi,
> 
> I would like to accomplish the following: "bind a functor to a
> reference and compose this with another functor". Ultimately I would
> like to use this composition with the reference embedded in it.
> 
> If I write it like this:
> 
>  functor_type h = bind(f, bind(g, ref(b)));
> 
> it works alright. However, in my situation the binding of g is done
> somewhere else in the program, so have:
> 
>  functor_type temp = bind(g, ref(b));
>  ...
>  functor_type h = bind(f, temp);
> 
> Sadly enough this does not appear to work. I don't have a reference
> to b in h().

bind( f, temp ) calls f( temp ). If you want f( temp() ) instead, use

    bind( f, bind( temp ) ).