Subject: Re: [Boost-users] Multi Index: Nested std::pair
From: Kimon Simons (kimon.simons_at_[hidden])
Date: 2009-04-26 09:36:00
Was your intention to store lists of pairs as you show in the multi_index
declaration
std::list<
std::pair<
/*value*/
unsigned char,
std::pair<
/*x co-ordinate*/
unsigned char,
/*y co-ordinate*/
unsigned char
>
>
>,
or just tuples of {unsigned Value, X-coordinate,Y coordinate} emulated by
Value, std::pair<X,Y>, as implied by your index declaration ?
boost::multi_index::indexed_
>
> by<
> /*value*/
> boost::multi_index::ordered_non_unique<
> boost::multi_index::identity<unsigned char>
> >,
> /*x co-ordinate*/
> boost::multi_index::ordered_non_unique<
> boost::multi_index::identity<unsigned char>
> >,
> /*y co-ordinate*/
> boost::multi_index::ordered_non_unique<
> boost::multi_index::identity<unsigned char>
> >
> >
If the latter is the case have you thought of using boost::tuple directly?
Just a thought
Kimon
On Sun, Apr 26, 2009 at 4:11 PM, Etienne Philip Pretorius <
icewolfhunter_at_[hidden]> wrote:
> Hello List,
>
> I would greatly appreciate if someone could assist me in getting this
> structure correct.
>
> boost::multi_index_container<
> std::list<
> std::pair<
> /*value*/
> unsigned char,
> std::pair<
> /*x co-ordinate*/
> unsigned char,
> /*y co-ordinate*/
> unsigned char
> >
> >
> >,
> boost::multi_index::indexed_by<
> /*value*/
> boost::multi_index::ordered_non_unique<
> boost::multi_index::identity<unsigned char>
> >,
> /*x co-ordinate*/
> boost::multi_index::ordered_non_unique<
> boost::multi_index::identity<unsigned char>
> >,
> /*y co-ordinate*/
> boost::multi_index::ordered_non_unique<
> boost::multi_index::identity<unsigned char>
> >
> >
> > m;
>
> I do not see how "boost::multi_index::ordered_non_unique" will index the
> appropriate field in the nested std::pair structures. This is why I suspect
> there to be a problem with this structure.
>
> So before I continue, could someone please tell me if I am on the correct
> path.
>
> Grateful,
> Etienne
>
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