I Didn't Order That, So Why Is It On My Bill, Episode 2

This is the second episode of I Didn't Order That, So Why Is It On My Bill: C++ features you never use, but pay for anyways. See episode one here. For those who like their punchlines first: std::string is designed to allow copy-on-write. But once operator[] is called, that string is ruined for COW forevermore. The reason is that it has to guard against a future write at any time, because you may have stashed away the internal pointer that operator[] returns - a feature that you surely know b...

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