Re: [Boost-users] Bind, lambda and how to chain relative function calls

24 Nov 2005

      On 11/24/05, Kerner, Jacques  wrote:
...
Hi,
I would like to create a functor for calling functions in a chain like this
:
car.GetRigidBody().GetPosition().GetX()
What is the best way to do that using bind (and lambda ?)
The car.GetRigidBody() is easy : bind(&Car::GetRigidBody, &car) , but then I
am a bit stuck. Note that I don't want to store the result of
car.GetRigidBody(). I want the final functor to call all the functions
everytime its operator() is called. So
bind    (
                &Position::GetX,
                &bind   (
                                &RigidBody::GetPosition,
                                        &bind   (
&Car::GetRigidBody,
&car
                                                        )()
                                )()
        )
would not be acceptable…
Any help greatly appreciated
Jacques Kerner
You're nearly there:

bind(&Position::GetX,
     bind(&RigidBody::GetPosition,
          bind(&Car::GetRigidBody,
               &car)));

should do the job - i.e. no '&' on the binds.

Stuart Dootson