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Expression-sum-field

Make-expression-sum-field

Basic constructor macro for expression-sum-field structures.

Syntax

(make-expression-sum-field [:type <type>] 
                           [:target <target>] 
                           [:alternative <alternative>] 
                           [:field <field>])

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

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

Definition

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

Macro: make-expression-sum-field

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

Function: expression-sum-field

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