Hi, Firstly after defining my own sh::pool allocator new doors opened on their own and now I am able to replace the "new_sh<>()" function call with a much more neat C++ approach with "new shifted<>()". For example instead of: shifted_ptr<char[9]> u = new_sh<char[9]>(); Now we can write: shifted_ptr<char[9]> u = new shifted<char[9]>(); This will allows us defining STL container allocators more easily because of the distinct steps the constructor and allocator are called; new_sh<>() was mixing them altogether. Secondly I was able to drastically clean up "class shifted<>" (was: owned<>) by unifying the construction of the member object with the construction of the class itself. This was necessary to use "new shifted<>()" adequately. Last but not least the library now takes advantage of the fast_pool_allocator for objects such as "struct set" and "numeric::interval<int>". FYI I am using "numeric::interval<int>" instead of "numeric::interval<void *>" because of a compilation failure with the latter. I am casting the pointers to an "int" meanwhile because there is no lost of information by doing so according to the standards. The files are both on Vault and the Sandbox and is nearly the official release. Documentation will follow soon for those who got no clue what I'm talking about: http://www.boost-consulting.com/vault/index.php?action=downloadfile&filename=shifted_ptr.zip&directory=Memory Thanks, -Phil