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This glossary is a compilation of the most important technical terms that are topic in this book. See [StroustrupGlossary] for a very complete, general glossary of terms used by C++ programmers.
A class for which the creation of concrete objects (instances) is impossible. Abstract classes can be used to collect common properties of different classes in a single type or to define a polymorphic interface. Because abstract classes are used as base classes, the acronym ABC is sometimes used for abstract base class.