[boost] Generic copy-on-write infrastructure in boost?

Hi, I'm looking for a way to implement a project using some copy-on-write feature, similar to how STL strings use reference counters to prevent needles copying of data. Is there anything in boost to help me out with this? -Jason ---------------------------------- Check out the Barracuda Spam & Virus Firewall - offering the fastest virus & malware protection in the industry: www.barracudanetworks.com/spam