Re: [boost] Review request: indexed_set

From: Joaquín Mª López Muñoz (joaquin_at_[hidden])
Date: 2003-09-11 07:30:55

Jonathan de Halleux ha escrito:

> Ok, the example was too trivial.
>
> Suppose that I add a products struct and a product_id to the order struct:
>
> struct order
> {
>       int id;
>       int client_id; // foreign key to client
>       int product_id; // foreign key to product
>       bool operator<(const order& o)const{return id<o.id;}
> };
> struct product
> {
>      int id;
> }
>
> I define another set to products. How do I perform joins on those three
> sets ? For example,
>
> get all the order done by a client c and of a product p ? :)
> I've seen in ex. 3 that you define some kind of intermediary view. Is there
> a way to "automate" that ?
>

Basically, the examples uses an indexed_set of pointers to the objects
instead of actual objects, thus avoiding copying.
This thing could be automated, but I think it'll get us far too away from the
original intention of the library.
Arkadiy Vertleyb et al. are working on a relational database STL-like
framework --my hunch is that indexed_set could serve as a robust
building block in that library.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo