Hi Community, The Function Types library has just been updated to include an implementation of closure functions as an example: [ example (hpp): http://tinyurl.com/9ncso ] [ exmaple (cpp): http://tinyurl.com/9opx6 ] You need to have the Function Types library installed if you want to successfully compile it: [ archive (zip): http://tinyurl.com/4oe7q ] [ documentation: http://tinyurl.com/4fw9n ] A closure function (in object orientated context) is a member function bound to an object. Closure functions are well-suited to achieve orthogonal design because they capture member functions independent of their name and class an thus allow to operate on a per-function basis instead of requiring inheritance to e.g. implement classic design patterns such as "Observer". In contrast to Boost.Bind (and other Boost argument binding facilities) closures are intended to be stored and allow the captured target function to dynamically change at runtime. Out of curiosity I was wondering if there is a closure function implementation in Boost already (or components that make their implementation trivial - IIRC I have seen something labeled 'closure' in the vault, but I can't find it anymore), whether there is any interest in brushing it up to give it a right to exist somewhere outside an 'example' folder and what requirements you would like it to meet in this case. I know there are "closures" in Boost.Phoenix, but these are about capturing fields, which is not quite the same and why I used the term "closure function" instead of "closure" here. What I describe here is close to the BCC compiler extension '__closure', which is used by C++Builder IDE to easily map GUI (and other) events to member functions. Regards, Tobias