Essential Books

Classes and Multiple Inheritance

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Swift does not support multiple inheritance. That is, you cannot inherit from more than one class. 

class Animal { ... }
class Pet { ... }

class Dog: Animal, Pet { ... } // This will result in a compiler error.

Instead you are encouraged to use composition when creating your types. This can be accomplished by using protocols.

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Classes:
* Classes
* Defining a Class
* Properties and Methods
* Reference Semantics
* Classes and Multiple Inheritance
* deinit
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