Including source VS including in header

In the real world:

• If possible, #include in source files, not in header (localize)
• Header files only need includes that are used in the header file
• Avoid namespaces

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In this course, when using internal header (.ih) files

• Feel free to use namespaces even in header file
• #include everything in .ih
• (only) include header file in every source

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