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That solved the problem, never had to use extern before so the thought didn't pop into my head. Thanks very much for helping with my stupid mistake.

It compiles fine when it's not declared. The problem arises with a declaration. I've been using rebuild all the entire time I spent on this, so that hasn't helped. I just tried cleaning the project...

Theres quite a bit of code, so I don't know if posting it will help or just make the page full of useless info, so I'll just state the problem and info.

I declare a std::map called KeyMap, and a...