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• Vl-echarpack-p

Vl-echarpack->code

Signature

(vl-echarpack->code x) → code

Arguments

x — Guard (vl-echarpack-p x).

Returns

code — Type (unsigned-byte-p 8 code), given the guard.

Definitions and Theorems

Function: vl-echarpack->code$inline

(defun vl-echarpack->code$inline (x)
  (declare (xargs :guard (vl-echarpack-p x)))
  (let ((__function__ 'vl-echarpack->code))
    (declare (ignorable __function__))
    (if (consp x)
        (the (unsigned-byte 8) (cdr x))
      (the (unsigned-byte 8)
           (logand (the (unsigned-byte 60) x)
                   255)))))

Theorem: return-type-of-vl-echarpack->code

(defthm return-type-of-vl-echarpack->code
  (implies (and (force (vl-echarpack-p x)))
           (b* ((code (vl-echarpack->code$inline x)))
             (unsigned-byte-p 8 code)))
  :rule-classes
  ((:rewrite)
   (:type-prescription
        :corollary (implies (vl-echarpack-p x)
                            (natp (vl-echarpack->code x))))
   (:linear :corollary (implies (vl-echarpack-p x)
                                (< (vl-echarpack->code x) 256)))))

Theorem: vl-echarpack->code-of-vl-echarpack

(defthm vl-echarpack->code-of-vl-echarpack
  (implies (and (force (unsigned-byte-p 8 code))
                (force (natp line))
                (force (natp col)))
           (equal (vl-echarpack->code (vl-echarpack code line col))
                  code)))