Re: [Boost-users] [bind] for_each, Member function question.

From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2007-09-13 08:11:56

Hughes, James wrote:
> I have a question for boost:binders out there... In the following
> scenario..(pseudocode)
> 
> Class Fred
> {
>  typedef std::map<wstring, shared_ptr<SomeType> > MyMap;
> 
>  MyMap Bert;
> 
>  Save(MyMap::iterator pos)
>  {
>     ...
>  }
> 
>  SaveAll()
>  {
>     for_each(Bert.begin(), Bert.end(), bind(&Fred::Save, this, _1);
>  }
> 
> };
> 
> 
> The code wants to save all the data in the map. The bind, I was hoping,
> would simply call Save for all items in the map, passing in the iterator
> as the parameter, but I get a template compile fault on the bind. I've
> tried all sorts of combinations, checked boost docs, read the chapter in
> Beyond the C++ standard library, Googled etc, but just cannot figure out
> what I need to do here.

std::for_each passes the dereferenced iterator value to the function 
object. You'll need to at least change the signature of Save to:

        void Save( MyMap::value_type& val )...

Jeff Flinn