Re: [Boost-users] boost::unordered_map using boost::interprocess::cached_node_allocator compilation failure

El 15/09/2011 9:53, Daniel James escribió:

On 14 September 2011 22:35, Lenny Maiorani wrote:

...

Hi Boost-ers,

I am trying to create a boost::unordered_map in a boost::interprocess::managed_shared_memory segment. This works fine until I try to change from using boost::interprocess::allocator to boost::interprocess::cached_node_allocator.

It seems that the hash_bucket structure is deferring the key size calculation, but the cached_node_allocator needs the size at compilation time. Any ideas on how to make this work?

Below is a sample attempt which displays my problem along with the GCC output.

The problem is that the unordered containers do something similar to:

template struct node { typedef typename Allocator::template rebind::other alloc; typedef typename alloc::pointer;

T value; pointer next; };

Maybe using pointer_to_other (with new allocator_traits class in C++11 the work is derived to pointer_traits, which does not require instantiating the allocator, I guess)? Best, Ion