What you need is something that guarantees not to move its elements rather than something that doesn’t guarantee contiguous memory. I don’t know if deque does this but you could end up with code that only works if it’s built with the right compiler…

 

From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Igor R.
Sent: 16 May 2008 12:04
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] is read/write mutex example correct

 

I see... Then the whole problem could be solved just by using deque instead of vector - since deque does't guarantee contiguous memory block for its elements, and thus it shouldn't reallocate the storage.

> >> > The problem with this code is that you are returning a reference > to data that might be immediately invalidated. A push_back via > another thread can cause the referenced memory to no longer be valid.
> > Does push_back() really invalidate iterators to *previous* vector elements?!
>
> Yes: it might have to allocate a new chunk of memory for the vector, in which
> case it will have to move all the existing elements to the new memory, and
> free the old one.
>
> Anthony

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