5.3.51 multiple-value-prog1 [Special Operator]

multiple-value-prog 1 ⇒ first-form {form}*

first-form-results

Arguments and Values::

first-form—a form; evaluated as described below.

form—a form; evaluated as described below.

first-form-results—the values resulting from the evaluation of first-form.

Description::

multiple-value-prog1 evaluates first-form and saves all the values produced by that form. It then evaluates each form from left to right, discarding their values.

Examples::

 (setq temp '(1 2 3)) ⇒  (1 2 3)
 (multiple-value-prog1
    (values-list temp)
    (setq temp nil)
    (values-list temp)) ⇒  1, 2, 3

See Also::

prog1