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Showing content from https://www.lispworks.com/documentation/HyperSpec/Body/m_format.htm below:

CLHS: Macro FORMATTER

Syntax:

formatter control-string => function

Arguments and Values:

control-string---a format string; not evaluated.

function---a function.

Description:

Returns a function which has behavior equivalent to:

  #'(lambda (*standard-output* &rest arguments)
      (apply #'format t control-string arguments)
      arguments-tail)

where arguments-tail is either the tail of arguments which has as its car the argument that would be processed next if there were more format directives in the control-string, or else nil if no more arguments follow the most recently processed argument.

Examples:

(funcall (formatter "~&~A~A") *standard-output* 'a 'b 'c)
>>  AB
=>  (C)

(format t (formatter "~&~A~A") 'a 'b 'c)
>>  AB
=>  NIL

Side Effects: None.

Affected By: None.

Exceptional Situations:

Might signal an error (at macro expansion time or at run time) if the argument is not a valid format string.

See Also:

format

Notes: None.

• PRETTY-PRINT-INTERFACE

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