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Holder -- the class of all holder expressions


This type of expression is a container for a single, arbitrary, thing that is basic enough that the correct method for printing does not depend on its neighbors in the containing expression. A negative number would not be basic enough for this purpose, since as a member of a sum, it would require special treatment.

Types of holder :

Methods that use a holder :

For the programmer

The object Holder is a wrapper type, with ancestor classes Expression < BasicList < Thing.