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Here the base class template will take advantage of the fact that member function bodies are not instantiated until after their declarations, and it will use members of the derived class within its own member functions, via the use of a <code>static_cast</code>, thus at compilation generating an object composition with polymorphic characteristics. As an example of real-world usage, the CRTP is used in the [[Boost library|Boost]] [[iterator]] library.<ref>{{Cite web|url=http://www.boost.org/libs/iterator/doc/iterator_facade.html|title = Iterator Facade - 1.79.0}}</ref>
Another similar use is the "[[Barton–Nackman trick]]", sometimes referred to as "restricted template expansion", where common functionality can be placed in a base class that is used not as a contract but as a necessary component to enforce conformant behaviour while minimising code redundancy.
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