Re: [Boost-users] [boost-users][multi-index] iterating though index keys

From: Igor R (boost.lists_at_[hidden])
Date: 2008-06-12 13:58:54

Hi Joaquín,

>  for(Entries::iterator
> it_key=entries.begin(),end=entries.end();it_key!=end;){
>   // get all elements with key it_key->someForeignKey
>   std::pair<Entries::iterator,Entries::iterator> values=
>     entries.equal_range(it_key->someForeignKey);
>   while(values.first!=values.second){
>     // process element
>     ++values.first;
>   }
>   // next key is just that of  the element right after the current value
> group
>   it_key=values.second;
>  }

Thank you! It seems to be exactly what I need.
However, I'm not sure I got the principle right: how come that "next
key is just that of  the element right after the current value"? Is
this the general behavior of equal_range - despite of the kind of the
index (ordered/hashed, unique/non-unique)?