The formal review of Fernando Cacciola's Optional library begins today and runs until the end of Wednesday, December 18. The Optional library provides a class template "optional<T>" that either contains a value of type "T" or contains no value (i.e., having a value is optional). It is useful, for example, as the return type of functions that may or may not return a value, depending on their inputs. The Optional library can be downloaded from the Boost files section: http://groups.yahoo.com/group/boost/files/optional.zip Please state in review comments whether or not you believe that the library should be accepted into Boost. Further guidelines for writing reviews can be found here: http://www.boost.org/more/formal_review_process.htm#Comments Thank you, Doug Gregor (Optional (but not uninitialized) review manager)