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Expression-sum-construct

Make-expression-sum-construct

Basic constructor macro for expression-sum-construct structures.

Syntax

(make-expression-sum-construct [:type <type>] 
                               [:alternative <alternative>] 
                               [:fields <fields>])

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

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

Definition

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

Macro: make-expression-sum-construct

(defmacro make-expression-sum-construct (&rest args)
  (std::make-aggregate 'expression-sum-construct
                       args '((:type) (:alternative) (:fields))
                       'make-expression-sum-construct
                       nil))

Function: expression-sum-construct

(defun expression-sum-construct (type alternative fields)
  (declare (xargs :guard (and (identifierp type)
                              (identifierp alternative)
                              (initializer-listp fields))))
  (declare (xargs :guard t))
  (let ((__function__ 'expression-sum-construct))
    (declare (ignorable __function__))
    (b* ((type (mbe :logic (identifier-fix type)
                    :exec type))
         (alternative (mbe :logic (identifier-fix alternative)
                           :exec alternative))
         (fields (mbe :logic (initializer-list-fix fields)
                      :exec fields)))
      (cons :sum-construct (list type alternative fields)))))