Microsoft MCSE certification Exam 70-292

A class that is used to hold objects in memory or external storage is often called a container class. 70-271 A container class acts as a generic holder and has a predefined behavior and a well-known interface. It is also a supporting class whose purpose is to hide the topology used for maintaining the list of objects in memory. When it contains a group of mixed objects, the container is called a heterogeneous container; when the container is holding a group of objects that 70-290 are all the same, the container is called a homogeneous container.An abstract class is, conceptually, a class that cannot be instantiated and is usually implemented as a class that has one or more pure virtual (abstract) functions.
A pure virtual function is one which must be overridden by any concrete (i.e., non-abstract) derived 70-292 class. This is indicated in the declaration with the syntax " = 0" in the member function's declaration.