How deeply does Learn C++ by Example cover final?

Covers function and class restrictions with compile-time consequences, but does not develop implementation internals.

Final

The final specifier is a C++ specifier that prevents a virtual function from being overridden or a class from being used as a base class.

The final specifier prevents a virtual function from being overridden or prevents a class from being used as a base class. section 6.1.2 section 6.2.4

Use final in two related ways:

Place it after a virtual member-function declaration to reject further overrides. section 6.1.2
Place it after a class name to make the class non-derivable; attempting to inherit from it fails to compile. section 6.2.4

A final class in the race example

Declaring `class StepperBlob final : public Blob` prevents a `DerivedStepper` class from using `StepperBlob` as its base. The compiler rejects that derived class. section 6.2.4

class StepperBlob final : public Blob

Inspect the class declaration that makes StepperBlob impossible to derive from. section 6.2.4

How Learn C++ by Example covers it

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Also explained in

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100 Java Mistakes and How to Avoid ThemThe final modifier is a Java declaration modifier that prevents reassignment of a local variable after its initialization or assignment.
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Kotlin in Action, 2EThe final modifier prevents a Kotlin class from being subclassed or a class member from being overridden.

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Related concepts

valequivalent to · val is a Kotlin declaration form for a variable or property whose binding cannot be reassigned after initialization.
immutable collectioncontrasts with · An immutable collection is a collection whose membership and contents cannot be changed after creation.
identityaddresses · Identity is the property or representation by which an entity is distinguished and recognized as that particular entity.

This explainer was generated by Manning's knowledge graph from the text of Learn C++ by Example. The section links point to the parts of the book it draws on.