Hi Pavel ----- Mensaje original ----- De: Pavel Vozenilek <pavel_vozenilek@hotmail.com> Fecha: Domingo, Abril 25, 2004 10:11 am Asunto: [boost] Re: [multi_index] composite keys: request for advice

"Joaquin M Lopez Munoz" <joaquin@tid.es> wrote:

...

Composite keys can be specified by a new construct called composite_key in the following manner:

OT question 1: will it be possible to specify calculated index as part of composite index?

I take you mean "calculated key" and "composite key". Yes, it is possible, composite_key does accept any key extractor, it needs not be multi_index::member.

OT question 2 (I could had asked already): would it be somehow possible for calculated index to use user supplied functor and then sorting sequenced index according this index?

This would create 'dynamic index', modifiable during runtime.

I'm not quite getting you; the following shows how to specifiy the comparison predicate at run time, I don't know if this is what you are asking. typedef multi_index_container< employee, indexed_by< ordered_unique< identity<employee>, boost::function<bool (const employee&)> >

employee_set;

... bool foo(const employee&); ... employee_set::ctor_args_list cal; cal.get<0>.get<1>=foo; // 2nd argument of the first index employee_set es(cal); Joaquín M López Muñoz Telefónica, Investigación y Desarrollo