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;
}