Default Memberwist Initialization: During initialize an object, base class's constructor(s) is(are) called, data members' are called, this constructor is called. Of course, this is a recursive procedure.
Bitwise copy semantics: raw memory copy. For example, given object a of Class A occupies 10 bytes memory from address 0x0 to 0x9, b = a will copy data from 0x0 to 0x9 to b's memory space if Bitwise copy semantics applies.
