multiple-value-prog1

ToC

Allegro CL

ANSI Common Lisp

5 Data and Control Flow

5.3 Dictionary of Data and Control Flow

5.3.51 multiple-value-prog1

Special Operator

Syntax:

multiple-value-prog1 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

Allegro CL Implementation Details:

None.