Re: [boost] Re: boost::function feature request?

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2004-11-06 06:41:11

Peter Dimov writes:
> >> I'm not sure what you mean. What functionality ought to be pushed
> >> into boost::bind?
> >
> > The ability to build an always(whatever) function object:
> >
> >    f = boost::bind(t);
> 
> This is not an improvement over
> 
> f = constant( t );

Yep, hardly.

> 
> It still needs a glue call. Also, it doesn't make much sense to use 
> boost::bind for this functionality, because constants do not have any 
> arguments that could be bound. The bind way to make a constant is bind( 
> identity<T>(), t ).
> 
> The original motivating example is this:
> 
> struct button
> {
>     boost::function<bool()> is_enabled;

How about

     function_property< boost::function<bool()> > is_enabled;

or

     function_property<bool()> is_enabled;

or even

     property<bool()> is_enabled;

which makes this:

> };
> 
> bool sometimes();
> 
> int main()
> {
>     button b;
> 
>     b.is_enabled = true;
>     b.is_enabled = false;
>     b.is_enabled = sometimes;
> }
> 

work?

--
Aleksey Gurtovoy
MetaCommunications Engineering