Re: [Boost-users] Multi-index container (Modifying non-unique key in the container)

From: Ramesh (rramesh1_at_[hidden])
Date: 2008-08-20 18:17:22

On Wed, Aug 20, 2008 at 8:02 AM, JOAQUIN M. LOPEZ MUÑOZ <joaquin_at_[hidden]>wrote:

>
>  ------------------------------
> *De:* boost-users-bounces_at_[hidden] [
> boost-users-bounces_at_[hidden]] En nombre de Ramesh [
> rramesh1_at_[hidden]]
> *Enviado el:* martes, 19 de agosto de 2008 20:16
> *Para:* boost-users_at_[hidden]
> *Asunto:* Re: [Boost-users] Multi-index container (Modifying non-unique
> key in the container)
>
>
>
> On Wed, Aug 13, 2008 at 10:20 AM, JOAQUIN M. LOPEZ MUÑOZ <joaquin_at_[hidden]>wrote:
>
>>  ------------------------------
>>  *De:* boost-users-bounces_at_[hidden] [
>> boost-users-bounces_at_[hidden]] En nombre de Ramesh [
>> rramesh1_at_[hidden]]
>>  *Enviado el:* martes, 12 de agosto de 2008 20:40
>> [...]
>> Hmm... I'm not referring to your myclass wrapper, but rather to the fact
>>  that you're storing DataMaps objects into the container rather than
>> A*s directly.
>>
>> Joaquín M López Muñoz
>> Telefónica, Investigación y Desarrollo
>>
>
> > Sorry if I got your question wrong, I am storing only pointers to objects
> > inside the map and each instance of myclass would hold one such
> > container to hold pointers to objects of class A along with keys.
>  Yes, but DataMap seems to *replicate* the keys that are already
> present in A. Cannot you just have the following?
>
> typedef multi_index_container<
>   A*,
>     indexed_by<
>         ordered_unique<
>             tag <Key1>, BOOST_MULTI_INDEX_MEMBER(A,std::string,Key1)>,
>         ordered_non_unique<
>                   tag<Key2>,BOOST_MULTI_INDEX_MEMBER(A,long,Key2)>,
>               ordered_unique<
>                   tag<Key3>,BOOST_MULTI_INDEX_MEMBER(A,long,Key3)>
>     >
> > tDMap;
>
> Joaquín M López Muñoz
> Telefónica, Investigación y Desarrollo
>
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>

If I would remove the keys the map would just hold pointers and I wouldnt be
able to do lookups based on the keys (to retrieve pointers to objects based
on keys) if I wouldnt pair the pointers with they keys in the Map - thats
why I have the keys in the map, please correct me if am wrong.

Thanks
Ramesh