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Recently I had a new 'first-time' moment. You know the ones, the, 'oh right', moments, after you put in a bit of research. Mine was, as you might expect from all the other recent content, related to C++. I learned, the hard way, that 'iterator-based for loops' don't like to be resized during the loop. Well, they don't really care, but some precautions are to be taken since the 'iterator' used in the loop might be invalidated. Or as the very helpfull error during the crash prints to the console, ...