diff options
Diffstat (limited to 'src/combinator.lisp')
| -rw-r--r-- | src/combinator.lisp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/combinator.lisp b/src/combinator.lisp index a133c2b..a67bba8 100644 --- a/src/combinator.lisp +++ b/src/combinator.lisp @@ -149,6 +149,19 @@ apply the elements of REQUIREMENTS in reverse order." :unapply (get psym 'papply) :args args))) +(define-function-property-combinator desc (desc propapp) + (:retprop :type (propapptype propapp) + :desc (lambda () desc) + :hostattrs (lambda (&rest args) + (declare (ignore args)) + (propappattrs propapp)) + :apply (lambda (&rest args) + (declare (ignore args)) + (propappapply propapp)) + :unapply (lambda (&rest args) + (declare (ignore args)) + (propappunapply propapp)))) + (defmacro on-change (propapp &body on-change) "If applying PROPAPP makes a change, also apply each of of the propapps ON-CHANGE in order." |