Re: boost lambda library compile error

From: Daniel Silva (yg-boost-users_at_[hidden])
Date: 2002-08-21 09:48:54

> See http://www.boost.org/status/cs-win32.html
>
> Lambda does not and will not compile on MSVC until MSVC 7.1 is released
(I'm
> told that it does work in this environment).
>
> - Dale.

wow, thanks for the quick reply!

ah ok, guess I'll have to wait for their update.
by the way, I read most of the lambda lib doc, but I was wondering if it
works just like a lambda expression in other languages like lisp...  fairly
simple use: I have a Dialog class with a close() method and a Button class
with a on_click event (which I guess would be the lambda function), and I'd
like my button object to close the dialog.. so that I'd have..

class mydialog : public virtual Dialog
{
   public:  Dialog() {  mybutton.on_click = lambda({this->close();}); }
 ....
  protected:
      Button mybutton;
  };

so I guess that lambda(...) part would actually be: bind(this,
Dialog::close)  ?

I guess my real question is, does the LL support closures in the sense that
I can use all bound variables at the time of the lambda definition and
create an in-place function, or is that too much to ask of c++?  I'm trying
to emulate something like internal variable this from a PLT Scheme dialog
class:

(define edit-btn (make-object button%  ; class
                              "Edit Painting"  ; label
                              this  ; parent
                              (lambda (obj event)  ; on-click proc
                                (send controller edit-view))))