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.
Puffy ankles are common during pregnancy and though it causes discomfort to you it is a sign that your pregnancy is going just the way it should be. Almost 3 in every 4 pregnant women experience edema, and it starts somewhere around weeks 22 and 27 of pregnancy.