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Waveform Audio File Format  |  1993-10-22  |  342.4 KB  |  1 channel  |  11,025 sample rate  |  31 seconds
Transcription: Objects of these two classes could represent lines of customers in a store. In both, the data member serving is the person being served. The member waiting refers to the line of people waiting to be served. The version on the right is not valid because the definition of the type LineUp is not complete when the LineUp object waiting is declared. The version on the left is valid because the compiler needs only the declaration of the type LineUp before constructing the pointer waiting.