I propose 3 changes/additions made to boost::any: 1. Support for custom allocator types. 2. Support for in-place factories. 3. Last but not least boost::variant style visitors. I'll elaborate on the last one, i've written primarily support for boost::variant style visitors for boost::any. The method is based on the acyclic visitor pattern and works as follows: struct printer_fn : boost::dynamic_visitor<int, std::string> { void operator()(int) const { std::cout << "int\n" } void operator(const std::string&) cosnt { std::cout << "string\n" } } const printer; ...... boost::any a = 1; boost::apply_visitor(a, printer); a = std::string(); boost::apply_visitor(a, printer); I'm looking to also provide the ability to extend their visitors (and override if need be) to support more types as well as provide "catch-all" (i.e (const) boost::any&) implementation which defaults to throwing an exception. I also want this to be constant-correct in the way of const_iterator and iterator, i need to look into this carefully since there are 4-cases to deal with (instead of 2). Is there any interest for these changes/additions? Thanks. Korcan Hussein. _________________________________________________________________ Be the first to hear what's new at MSN - sign up to our free newsletters! http://www.msn.co.uk/newsletters