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Apparenty it was because I forgot to put a use a semicolon while closing a class. Unfortunately there seem to be a ton of other problems. I'm gonna try to figure them out on my own before posting...

Thanks for that. I feel a bit dumb now. Unfortunately, it still won't work. So far:
string asString(bool *walls, int width, int height) {

My compiler keeps telling me that "`string' does not name a type" and highlighting this line:
string asString(bool *walls, width, height) { (If you're curious, it's suppose to give a textual...