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Backref

Make-backref

Basic constructor macro for backref structures.

Syntax

(make-backref [:loc <loc>] 
              [:len <len>])

This is the usual way to construct backref structures. It simply conses together a structure with the specified fields.

This macro generates a new backref structure from scratch. See also change-backref, which can "change" an existing structure, instead.

Definition

This is an ordinary make- macro introduced by defprod.

Macro: make-backref

(defmacro make-backref (&rest args)
  (std::make-aggregate 'backref
                       args '((:loc) (:len))
                       'make-backref
                       nil))

Function: backref

(defun backref (loc len)
  (declare (xargs :guard (and (natp loc) (natp len))))
  (declare (xargs :guard t))
  (let ((__function__ 'backref))
    (declare (ignorable __function__))
    (b* ((loc (mbe :logic (nfix loc) :exec loc))
         (len (mbe :logic (nfix len) :exec len)))
      (std::prod-hons loc len))))