The public interface of a software component, i.e., an element such as a header file that’s readily visible to the developer, is often the software’s most important feature. Best practices in the development and maintenance of application programming interfaces (APIs), or what we might cleverly call “APIdeology,” dictate that software interfaces do not change once they have been released, with the exception of adding new entry points. Therefore, it is very important to design concise, extensible software interfaces that can be adapted to survive in an evolving hardware/software ecosystem.
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