Hi, I have several questions related to boost. 1. Are boost::smart pointers thread safe especially shared_ptr ? Although it seems but I still want to be sure of that. 2. Why isn't there two flavours of every smart pointers, one with multithread safety and one without. If one is using some smart pointers in non threaded mode, then still does one need to pay the penalty for exclusive access ? What this means is that for example when one is using shared_ptr which I assume is implemented as counted pointer, any count increment or decrement has to be lock protected in multi-threaded case, which will be an overkill if one is using shared_ptr in a non multi-threaded code. 3. To enable multi-thread safety for other various libraries especially which are non-templates, does one need to compile boost with some special flags passed to the bjam? I am not sure whether this question is suited for this mailing list or not. Correct me if this is not the correct platform for posting this question. Thanks, Divick __________________________________________________________ Yahoo! India Matrimony: Find your partner now. Go to http://yahoo.shaadi.com