LinkOb to indirectly link objects on a LinkedList is less efficient than directly linking objects derived from class Link on a LinkedList . Since a LinkOb behaves the same as the indirectly linked object with respect to these functions, you can substitute a LinkOb in place of its value object for any of these operations. Constructs a LinkOb , initializing its value object pointer to newVal . Sets the value object pointer of this LinkOb to newVal , and returns the previous value object pointer. The comparison is done this way to permit ob to be a LinkOb .
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