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.

What happens if you define a global variable in a header file?

What is the one definition rule in C regarding global variables?

How can you declare a global variable that can be used in different source files?

Explain the use of the 'extern' keyword in relation to global variables.

What is the effect of using the inline keyword on a global variable?

How has the handling of static member variables changed in C-17?

What is the significance of constant expression static member variables in C?