Use static in classes (when needed) in modern C++

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Everything that you wanted to know about static (when it is used *inside* of classes) but were afraid to ask. For when (not) to use static *outside* of classes, see https://youtu.be/7cpPQunjv4s

📚 As always, the script to the video lives here: https://github.com/cpp-for-yourself/supplementary-materials/blob/main/lectures/static_in_classes.md

00:00 - Intro
01:26 - Static class methods
04:54 - Static class data
08:55 - Typical usage examples
15:14 - Summary

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Corrections:
01:48 There is a missing Foo:: before the function out-of-class definition.
02:03 Still the same missing Foo:: before the function out-of-class definition.