Complete Modern C++ - Inline Variables

The video tutorial discusses the challenges of using global variables in C programming, particularly when declared in header files, which can lead to linker errors due to multiple definitions. It explains the one definition rule and how to properly declare global variables using the extern keyword. The tutorial also covers the use of the inline keyword introduced in C-17, which allows for multiple definitions of a global variable without linker errors. Additionally, it explains how the inline keyword can be applied to static member variables within classes, enabling header-only libraries.

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