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  ANSI Common Lisp   22 Printer   22.4 Dictionary of Printer

22.4.28 *print-right-margin* Variable

Value Type:
a non-negative integer, or nil.

Initial Value:

If it is non-nil, it specifies the right margin (as integer number of ems) to use when the pretty printer is making layout decisions.

If it is nil, the right margin is taken to be the maximum line length such that output can be displayed without wraparound or truncation. If this cannot be determined, an implementation-dependent value is used.

This measure is in units of ems in order to be compatible with implementation-defined variable-width fonts while still not requiring the language to provide support for fonts.

Allegro CL Implementation Details:

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