[Boost-users] [Interprocess] Using existing containers after grow()

Subject: [Boost-users] [Interprocess] Using existing containers after grow()
From: Malko (malko.bravi_at_[hidden])
Date: 2015-03-04 08:36:45

Hi,

I am having some difficulties understanding the relationship between 
allocators for containers and grow().
Let's say I create a vector (whatever type) in shmem, then I unmap 
everything and proceed to grow the shmem from 1MB to 2MB and remap.
I can now access my old vector and start adding new entries.

What I am unsure about is: would this vector be able to create new entries 
until the whole 2MB are allocated, or would it stop at 1?
I have not seen anywhere in the docs any warning about the need to 
construct new containers after a grow, so I assume my vector can grow up 
to to 2MB now. Then my question is: how does it know that now it can grow 
up to 2MB if the allocator I passed on construction was instantiated from 
a segment_manager that knew about a shmem of size 1MB? Is there somewhere 
in shared memory a segment_manager-like object that stores info about the 
shmem itself (and can I access it in my code)?

Any help would be greatly appreciated,

Malko