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Yeah, still getting used to those being in the language.

A temporary binds to a const reference, never a non-const reference. And a function that returns an iterator creates a temporary. It's also possible to create a temporary with a constructor call or...

In addition to Elysia's example, any time an iterator is created as the return value of a function, that iterator is const, because it's a temporary, and must use the const version of the operator.