[C++ Tutorial #10] Files, Includes, Namespaces, Pragma Once

One Definition Rule:
https://en.cppreference.com/w/cpp/language/definition

Include Directive:
https://docs.microsoft.com/en-us/cpp/preprocessor/hash-include-directive-c-cpp?view=vs-2019

VC++ Directories:
https://docs.microsoft.com/en-us/cpp/build/reference/vcpp-directories-property-page?view=vs-2019

Pragma Once:
https://docs.microsoft.com/en-us/cpp/preprocessor/once?view=vs-2019

I haven't talked about things like circular dependency (got too carried away talking about the practical basics of includes, header files, namespaces, pragma once, etc.
Let's go deeper later.

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Repository:
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Intro: (0:00)
Header files(1:01)
Includes: (2:04)
Pragma Once: (4:27)
Namespaces: (6:05)
Outro: (9:02)

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