Re: [Boost-Users] How to use boost::bind

From: Douglas Gregor (gregod_at_[hidden])
Date: 2003-08-26 07:58:46

On Monday 25 August 2003 10:21 pm, Darren Cook wrote:
> Thanks for the reply. I can almost match that up to the parts in the while
> loop, except mention of "list" is missing. Should it be:
>
>   	boost::bind(&Points::add, &list,
>   		boost::bind(&Info::key,
>   			boost::bind(&InfoContainer::get, &cs, _1))));

Yes, that's correct.

> BTW, I was hoping I'd be able to do something like this:
>      std::for_each(c->points.begin(),c->points.end(),
>          list.add(cs.get( _1 )->key)
>           );

This is why we want lambda support in the language :)

> But after some experiments with boost::lambda I see why this isn't
> possible. I think if just one call to bind is possible then it is worth it,
> but when bind is required 2 or more times, falling back to a while loop or
> a functor seems better. Is anyone else using a similar guideline?
>
> Darren

I still find the bind/lambda versions less error-prone than writing the 
equivalent (small) for/while loop, but I tend to put the lambda expression 
that I really want to write in a comment. 

        Doug