Re: [Boost-users] [MultiIndex] how to rebuild index

Subject: Re: [Boost-users] [MultiIndex] how to rebuild index
From: Joaquín M LópezMuñoz (joaquin_at_[hidden])
Date: 2012-02-24 01:55:38

Igor R <boost.lists <at> gmail.com> writes:
> 
> > But you just can't externally (with const_cast) modify a bunch
> > of elements and then get the index to rebuild --the rebuilding machinery
> > assumes that at most one element (the one you call modify() on) is out
> > of place, so if other elements are shuffled as well you'll get
> > some sort of undefined behavior: core dump, whatever.
> 
> What if I just copy all the elements to another container of the same
> type? Will the iteration from begin() from end() work correctly?

I think this might work (I suggest you try it.)
Remember that the source container is in an invalid internal
state (by altering the elements keys you've broken the container
invariants), so after doing the copy you should destroy it
immediately.

Again, all of this is strictly undocumented stuff. No guarantee
any of this will work in the event, say, of a library upgrade.
Maybe some reformulation of your data design can allow you to do
what you want while remaining in the shiny world of legal behavior.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo