I'm not sure what's best in this case. I find that there is often a certain trade-off between ease of use and runtime insecurities. For instance, it would have been useful to have a strict shared_ptr which could never be null. It's implemented easily by removing the default constructor and reset() and check+throw for non-null ptrs in the regular constructor and reset(T*). You would lose default-constructibility so you probably want to make the decision optional. Even if this could be implemented nicely by some policy parameter+default parameter, the option would mean a larger and more complicated abstraction for the user. Best Regards, Johan -- View this message in context: http://www.nabble.com/-thread--Expected-behaviour-of-condition-variable-wait... Sent from the Boost - Dev mailing list archive at Nabble.com.