I'm using Boost ver 1.39.0 I have a module to which other modules can register callbacks. This module will call those callbacks with a couple of arguments - as an example registerCallBack(void (*callbackFunc)(int)); At the time of callback it will call: (*callbackFunc)(3); To allow for any function to be registered (each module's callback may have a different signature etc, but everyone can allow for this one last arg), I declared it to take a boost::function<void (int)> I was hoping that if I have a twoarg_callback(int, int) function, I can register it with the module by using boost::bind to bind the first argument, but that is not possible. I am unable to assign the return value of boost::bind to a boost::function<void (int)> object by binding one argument. However, assigning the return value of boost::bind where all the arguments of a function are bound (so the resulting object is a void() function) seems to work. I'm trying to decipher the errors, but would appreciate any help I can get. I get errors both on VisualStudio 2008, as well as g++ 4.1.2, so I'm guessing it's not some compiler problem rather it's my usage. Attached a sample source file. I commented out the 4 lines that were giving me errors. Thanks, Lakshman. The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/