Hi Pedro,
I suggest supplying a default constructor to the shared memory Allocator (and generally making it compatible with the Allocator concept) in order to allow the easiest uses, like:
std::queue<boost::shmem::allocator> global_queue;
But since a shared memory segment is dynamic (and because of that, the address is not known at compile time) how can the allocator know the address of the segment from where it has to allocate memory? Also, if the user opens more than one segment, you must say from which segment you want to allocate memory. If you have only one segment you could use a static object to tell so. This is a bit different from "operator new", because there is just one standard heap source and you don't need any handle to call global new. When allocating from shared memory, and since you can have multiple segment, you need dynamic data. But if you have any idea to initialize the allocator you think it's better than the current approach, I'm open to include it in Shmem. Regards, Ion