Re: lambda library usage

From: khuroth (dansilva_at_[hidden])
Date: 2002-08-27 09:52:27

Oh, that works, thanks!
To clarify though, for a member function, bind can be passed either 
an object pointer, an object reference, a function that returns an 
object pointer (the result of another bind), or a function that 
returns an object reference?

I'm definitely a fan of this library now =)

--- In Boost-Users_at_y..., Jaakko Jarvi <jajarvi_at_c...> wrote:
> > > I think what you want is something like
> > > bind( &Controller::DoSomething,
> > >          bind( &A::GetController, _1 ) );
> > 
> > That didn't work when I tried earlier, either because bind()
> > produces a function instead of a pointer to a Controller or 
because
> > GetController returns a reference instead of a pointer.
> 
> When binding member pointers, LL accepts either pointers or 
references
> as the object argument, and the above should thus work.
> 
> This example works for me:
> 
> #include "boost/lambda/bind.hpp"
> #include "boost/lambda/lambda.hpp"
> 
> #include <iostream>
> 
> using namespace boost;
> using namespace boost::lambda;
> 
> class Controller {
> public:
>   void DoSomething() { std::cout << "Hello World!"; };
> };
> 
> class View {
>   Controller& contr;
> public:
>   View(Controller& c) : contr(c) {};
>   Controller& GetController() { return contr; }
> };
> 
> int main () {
> 
>   Controller c;
>   View v(c);
>   
>   bind(&Controller::DoSomething, 
>     bind(&View::GetController, _1))(v);
> 
> };
> 
> /Jaakko
> 
> 
> 
> 
> > 
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> -- 
> --
> -- Jaakko Järvi                       email: jajarvi_at_c...
> -- Post Doctoral Fellow               phone: [phone]
> -- Pervasive Technology Labs          fax:   [phone]
> -- Indiana University, Bloomington