Protocol inheritance

- [Instructor] A protocol can inherit from one…or more protocols and add new requirements…on top of the inherited ones.…A protocol inheritance is a powerful feature…which lets create more granular designs.…Let's open the project by going through the desktop.…Exercise files, chapter two…0 two 0 five…start and opening the protocol…inheritance playground.…So, here is the binary representable protocol.…

Now, lets assume that we want to add new requirements.…Say, we need the ability to save instances…to the local storage and restore them later on.…Also, we need support for Base64 encoding.…We could squeeze in all the functionality in this protocol.…Yet, this means that we assign unrelated responsibilities…like persistence and Base64 encoding to this protocol.…This is a bad sign and it leads to the same issue…we had with monolithics superclasses.…

Instead, we create dedicated protocols…for each requirement set.…First, we create the protocol…that defines the persistence related requirements.…I'm going to call it, Binary Persistable.…