why 'extern' was used in the noui.h file?

why 'extern' was used in the noui.h file?

When i review the source code, i find that the noui.h is a header file, but the method noui_connect has been declared by key words 'extern'. i think there is no need to do this.

extern void noui_connect();

https://ift.tt/2PTFO1Z

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