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  Lesson 3 The scope resolution operator
 
Objective
 Unary form of the scope resolution operator.
The scope resolution operator's unary form is used to access a variable or object that is at external scope and that has been "hidden" by an identically named variable or object declared at local or class scope.
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int count = 0;        //external variable

void how_many(double w[], double x, int& count)
{
    for (int i = 0; i < N; ++i)
      count += (w[i] == x);
    ++ ::count;        //keep track of calls
}
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