Hi all, After a year since the last published draft, I think the flyweight library I'm working on is in a sufficiently polished state to issue a request for comments on its usefulness and eventual suitability for inclusion into the Boost review queue. * Abstract: Flyweights are small-sized handle classes granting constant access to shared common data, thus allowing for the management of large amounts of entities within reasonable memory limits. Boost.Flyweight makes it easy to use this common programming idiom by providing the class template flyweight<T>, which acts as a drop-in replacement for const T. * Design: The flyweight library is a relatively small piece of software that tries to combine both maximum simplicity of usage for casual users and great flexibility for those programmers needing to control aspects of the implementation. Configuration and customization rely upon a very extensive policy interface, whose syntax is kept under control thanks to the Boost Parameter Library. The following aspects can be controlled: - Specification and parameterization of the so-called flyweight factory. - Control of the factory instantiation procedure. - Specification of the internal synchronization mechanisms. - Flyweight tracking, allowing for the disposal of stored values when no longer referenced by any flyweight object. The library provides a catalog of plug-in components, but the user can also supply her own as the needed concepts are publicly documented. In particular, an insidious problem with duplication of flyweight factories across dynamic modules is taken care of by a component called intermodule_holder, whose implementation is based on Boost.Interprocess. * Download: Boost Vault, folder Patterns (http://tinyurl.com/hrdm6 ), file flyweight.zip. * Online docs: http://tinyurl.com/2jbucf . * Usage: Will only work with the trunk version of Boost, daily snapshot at http://boost-consulting.com/boost.tar.bz2 . Currently, serialization capabilities are not working, pending the resolution of the issue exposed at http://lists.boost.org/Archives/boost/2007/09/127065.php . * Tested on: GCC 3.4.4 on mingw, MSVC++ 8.0. Comments, suggestions, cricitisms, are most welcome. I would also like to know if there's interest in having this included in the review queue. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo