Subject: Re: [Boost-users] Multi Index: Nested std::pair
From: Etienne Philip Pretorius (icewolfhunter_at_[hidden])
Date: 2009-04-26 21:59:21
Etienne Philip Pretorius wrote:
>> /*unique values per x co-ordinate*/
>> boost::multi_index::ordered_non_unique<
>> boost::multi_index::composite_key<
>> element_t,
>> boost::multi_index::member<
>> element_t,
>> unsigned char,
>> &element_t::x
>> >,
>> boost::multi_index::member<
>> element_t,
>> unsigned char,
>> &element_t::value
>> >
>> >
>> >
>> >
>> > matrix_t;
>>
>> How would I define the "unique values per x co-ordinate" as there x
>> co-ordinate is suppose to be non unique while value in this key should
>> ONLY point to unique instances within that x co-ordinate?
>>
> Would this work?
>
> /*unique values per x co-ordinate*/
> boost::multi_index::ordered_unique<
> boost::multi_index::composite_key<
> element_t,
> boost::multi_index::member<
> element_t,
> unsigned char,
> &element_t::x
> >,
> boost::multi_index::member<
> element_t,
> unsigned char,
> &element_t::value
> >
> >
> >
>
> As it is not clear in the documentation what the
> "boost::multi_index::ordered_unique" scope is. IE is it the combination
> of the defined members (member vs member) of is it based on the first
> and then on the second (first vs first, second vs second).
>
The above does not seem to be correct as the algo does not succeed.
Could someone please give me advise on constructing a key that has
duplicate ("x" || "y") members while unique "values".
Etienne