Abstract class for all basic objects.
Abstract class for all basic objects. This class handles a connection mechanism with PoBase objects. Each instance of this class maintains a list of PoBase objects. So when an instance of this class is modified, the list of PoBase objects is informed of this change, and thus, they can update themselves. For more information about the connection mechanism, see the section "Connection
mechanism" of the paragraph "What you must know" of the reference manual. The constructor per copy and the assignment operator of any Pbxxx object do not copy the reference to Poxxx objects. This restriction prevents several Pbxxx objects (of the same class) from referencing the same Poxxx object.
Definition at line 49 of file PbBase.h.