std::string str = "z\u00df\u6c34\U0001F34C"; // or u8"zß水🍌"
I don't understand nor can I fin any information about the "z" prefix in this string,
why it must be there and what does it mean?
I've taken a look here to make sure I didn't miss anything:
but there is no mention of any "z"
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That isn't a prefix, it's just the first character of the string.
It's just possible that it somehow got confused with the 'Z' part of a "BOZ constant" - corresponding, somewhat weirdly, to hexadecimal.
However, in that case it should precede the string, not go inside it. As @Salem c says, as it stands it is the first character of the string.
lol, silly me...
Now that you said that it actually makes sense.