In instantiating the ImmutableString, the function pointers to the get and length methods actually refer to the String.get and String.length method, by going through the base variable which is an internally stored String object. The use of a function pointer can achieve inheritance of a method from a superclass.
Most women will start to show at some point between weeks 12 and 24 of pregnancy, with most reporting that they began to show during the first half of their second trimester, between 12 and 18 weeks.
Pregnancy symptoms usually begin to ease off around 14 - 16 weeks into the pregnancy and many mothers-to-be suddenly realise they are feeling and looking wonderful and have lots of energy! Unfortunately for some, however, the symptoms of pregnancy last right up until the birth.