C++ thread safe blocking queue using boost

In Software Engineering some patterns reoccur only every few years. The blocking queue pattern is on such for me. Here is a great article on an implementation of a thread-safe blocking queue that uses boost for synchronisation:

http://www.justsoftwaresolutions.co.uk/threading/implementing-a-thread-safe-queue-using-condition-variables.html

I implemented something like this some years ago (without the benefit of boost etc.) and now I need one again and I want to make it bang-up-to-date wrt. C++11 and boost etc., so this article is a real bonus, much thanks to Anthony Williams!