Re: boost::shared_ptr confusion...

From: someuserat (marktutt_at_[hidden])
Date: 2002-09-19 20:28:18

--- In Boost-Users_at_y..., "Peter Dimov" <pdimov_at_m...> wrote:
> >     for_each(widgetset_.begin(),widgetset_.end(),i->insert);
> > }
> 
> I think that you need bind(&WidgetMap::insert, i, _1) here.

Thanks!  I figured that one out this morning,

[...]
> maps_.erase(remove_if(maps_.begin(),maps_.end(),(boost::mem_fn
(&WidgetMap::g
> etIndexedMember)).equals(d)));
> 
> This is getting harder.
> 
> bind(&DataMember::equals, bind(&WidgetMap::getIndexedMember, _1), d)
> 
> would be my guess. Easier would be to define a helper function
> 
> bool memberEquals(WidgetMap const & m, DataMemberPtr d)
> {
>     return m.getIndexedMember().equals(d);
> }
> 
> and then use
> 
> bind(memberEquals, _1, d) in dropWidgetMember.

I actually ended up figuring out how to write a function object class 
to do something similar.  This has been a good learning experience!  
Is there a down side to the function object approach over the helper 
function?  From what I could tell, the helper function had to be a 
global function, which just didn't seem right.

Thanks,

Mark