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Alternative

Make-alternative

Basic constructor macro for alternative structures.

Syntax

(make-alternative [:name <name>] 
                  [:product <product>])

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

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

Definition

This is an ordinary make- macro introduced by fty::defprod.

Macro: make-alternative

(defmacro make-alternative (&rest args)
  (std::make-aggregate 'alternative
                       args '((:name) (:product))
                       'make-alternative
                       nil))

Function: alternative

(defun alternative (name product)
  (declare (xargs :guard (and (identifierp name)
                              (type-productp product))))
  (declare (xargs :guard t))
  (let ((__function__ 'alternative))
    (declare (ignorable __function__))
    (b* ((name (mbe :logic (identifier-fix name)
                    :exec name))
         (product (mbe :logic (type-product-fix product)
                       :exec product)))
      (list (cons 'name name)
            (cons 'product product)))))