Quote: need to determine the actual type to use a derived class. Ensure a homogeneous set, use a type field, or use virtual functions

Quotation Skeleton

To use derived classes … , the following problem must be solved: Given … There are three fundamental solutions to the problem: … [1] Ensure that … [2] Place a type field in the base class for the … [3] Use virtual functions. Pointers to base classes are commonly used … 1 yields homogeneous lists, that is, lists of … that is, lists of (pointers to) objects of …   Google-1   Google-2

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Additional Titles

Quote: a base class is commonly used for container classes such as set, vector, and list; the container may be homogeneous or heterogeneous

Quote: virtual functions identify the type of an object in a type-secure way

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