[Boost-users] [multi_index and flyweight]

Subject: [Boost-users] [multi_index and flyweight]
From: Samuel Charron (samuel.charron_at_[hidden])
Date: 2009-12-04 09:41:54

Hi,

I'm currently facing some limitations from flyweight and multi_index.

Let's begin with multi_index:

I'd want to have a multi_index storing containers, and have one index
based on all the contained elements.
For example:
two vectors [1 2 3] and [3 4] would be indexed as
1 -> [1 2 3]
2 -> [1 2 3]
3 -> [1 2 3] [3 4]
4 -> [3 4]

How would you do that ?

Flyweight:
I'd like to have a scoped flyweight, without tracking, i.e.:
{
  ... // create some elements
}
// All elements are deleted when leaving the scope.

However, currently I didn't see a method to clear the internal container.
One way I could do that would be copying - pasting the hashed_factory
and adding a clear method.
It would be easier to extend the class, just having the private
container be protected.
Would that be possible to do one a future release ?
Or is there another easy way to do so ?

Regards,

Samuel