formatter [Macro]

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

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::

section format [Function]

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