function pointer...click below

http://forum.codecall.net/topic/48576-function-pointers/#axzz2EfY7OYFV

http://www.learncpp.com/cpp-tutorial/78-function-pointers/

http://www.oopweb.com/CPP/Documents/FunctionPointers/Volume/CCPP/FPT/em_fpt.html#syntax