Holder -- the class of all holder expressions

Holder -- the class of all holder expressions

The wrapper type Holder is a member of the class WrapperType. Each object of class Holder is called a holder. Each holder is also a member of class Expression.

More general types (whose methods may also apply) :

Expression -- the class of all expressions

BasicList -- the class of all basic lists

Types of holder :

OneExpression -- the class all one expressions

ZeroExpression -- the class of all zero expressions

Holder -- a type of Expression.

This type of expresssion is a container for a single, arbitrary, thing which 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.

Functions and methods returning a a holder :

hold -- hold something in a holder expression

Methods for using a holder :

- Holder