12 The LISPWORKS Package

rebinding

Macro

Summary

Ensures unique names for all the variables in a groups of forms.

Package

lispworks

Signature

rebinding (&rest vars) &body body => form

Arguments

vars: The variables to be rebound.
body: A body of forms, the variables in which should be unique.

Values

Returns the body wrapped in a form that creates unique names for each variable.

Description

Returns the body wrapped in a form which creates a unique name for each of the variables (compare withgensym) and binds these names to the values of the variables. This ensures that the body can refer to the variables without name clashes with other variables elsewhere.

Example

After defining

(defmacro lister (x y)
   (rebinding (x y)
      '(list ,x ,y)))

: the form (lister i j) macroexpands to

(LET* ((#:X-77 I)
       (#:Y-78 J))
          (LIST #:X-77 #:Y-78))

See also

with-unique-names