Re: [Boost-users] custom allocators Re:pool_alloc

B Hart wrote:

Sorry, I don't get you...as I understand the pool is a singleton, and once out of scope I would assume all the memory for the set is released back to the OS.

If you mean when the std::set goes out of scope, then no.

And then "internal node type"...what is that?

Some STL containers (std::list, std::set, etc.) don't directly store elements of the type you specify. For example, a std::list would likely store list nodes that contain the data element itself as well as pointers to the previous and next nodes. In that case, a std::list< Foo, boost::pool_allocator<Foo> > doesn't allocate via boost::singleton_pool. It allocates via boost::singleton_pool.