extern keyword in C++

extern keyword in C++

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Ever come across the terms internal and external linkage? Ever wanted to know what the extern keyword is for and what declaring something static does in the global scope? Then this post is for you.

A translation unit refers to an implementation (.c/.cpp) file and all header (.h/.hpp) files it includes. If an object or function inside such a translation unit has internal linkage, then that specific symbol is only visible to the linker within that translation unit. If an object or function has external linkage, the linker can also see it when processing other translation units. The static keyword, when used in the global namespace, forces a symbol to have internal linkage. The extern keyword results in a symbol having external linkage.

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