What does my proff mean by this?? Operator double

I suppose to write a Fraction Class program. The instructions give a list of constructors and function names we have to have. On of the function names we have to have is
operator double - Return the value of the Fraction object as a double. Divide the numerator by the denominator to get this result.
the other ones are
operator *
operator +
operator =
operator ==

these ones i pretty much understand. It's that operator double i don't get. I wrote double operator / (Fraction&), but that doesn't seem right i think that would divide one Fraction object by another Fraction object. Any help here?
Those are conversion operators and you're supposed to implement one for double.
Search for "c++ conversion operators" to get more information.
cool thanx
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