A while ago, I proposed a persistence library and there was some interest. Since then, the prototype has evolved into a feature-complete, reasonably optimized, implementation. Here's a quick recap of what the library is supposed to do: --------- int main(){ ... shared_ptr<A> shared(new A); db_ptr<A> db(new A); ... } // "shared" is destroyed, "db" is saved to disk to ensure data consistency, there are transactions introduced: transaction tx; //change_objects tx.commit(); if change_objects throws an exception, causing tx to be destroyed without commit() being called, all changes are undone. --------- there is no complete documentation yet, but I've written an overview of the library interface, which can be found here: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=overview.html&directory=persistence& I'd appreciate your comments. please note the "open issues" section.