CS3 students, Constructor delegation is a C++11 feature when one constructor may invoke another constructor of the same class in the initialization list. Here is the discussion on this: https://www.ibm.com/developerworks/community/blogs/5894415f-be62-4bc0-81c5-3956e82276f3/entry/introduction_to_the_c_11_feature_delegating_constructors -- Mikhail