Re: [Boost-Users] boost::shared_ptr confusion...

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-09-19 11:26:23

From: "someuserat" <marktutt_at_[hidden]>
[...]
> void WidgetManager::addMap(const WidgetMapPtr i){
>     maps_.push_back(i);
>     // have to write a function adapter here?
>     for_each(widgetset_.begin(),widgetset_.end(),i->insert);
> }

I think that you need bind(&WidgetMap::insert, i, _1) here.

[...]
> void WidgetManager::dropWidgetMember(const DataMemberPtr d){
>
>     // delete any maps using the target member
>     // how to fix this bloody line?  getIndexedMember returns a
> DataMemberPtr to the member it is keyed on.
>
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.