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Overloading the >> Operator for Your Own Classes

Input streams use the extraction (>>) operator for the standard types. You can write similar extraction operators for your own types; your success depends on using white space precisely.

Here is an example of an extraction operator for the Date class presented earlier:

istream& operator>> ( istream& is, Date& dt )
   is >> dt.mo >> dt.da >> dt.yr;
   return is;
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