CLHS: Restart STORE-VALUE

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Restart STORE-VALUE

Data Arguments Required:

a value to use instead (on an ongoing basis).

Description:

The store-value restart is generally used by handlers trying to recover from errors of types such as cell-error or type-error, which may wish to supply a replacement datum to be stored permanently.

Examples:

     (defun type-error-auto-coerce (c)
       (when (typep c 'type-error)
         (let ((r (find-restart 'store-value c)))
           (handler-case (let ((v (coerce (type-error-datum c)
                                          (type-error-expected-type c))))
                           (invoke-restart r v))
             (error ()))))) =>  TYPE-ERROR-AUTO-COERCE
     (let ((x 3))
       (handler-bind ((type-error #'type-error-auto-coerce))
         (check-type x float)
         x)) =>  3.0

See Also:

Section 9.1.4.2 (Restarts), Section 9.1.4.2.2 (Interfaces to Restarts), invoke-restart, store-value (function), ccase, check-type, ctypecase, use-value (function and restart)

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