X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/sod/blobdiff_plain/f64eb323a5798e155cc494043f5f750abf50a482..00091ab3d552b0ab7bc177e19e86110d8c1cd20b:/src/class-layout-impl.lisp

diff --git a/src/class-layout-impl.lisp b/src/class-layout-impl.lisp
index d6b3e6d..452e683 100644
--- a/src/class-layout-impl.lisp
+++ b/src/class-layout-impl.lisp
@@ -388,4 +388,22 @@ (defmethod compute-vtables ((class sod-class))
 	    (compute-vtable class (reverse chain)))
 	  (sod-class-chains class)))
 
+;;;--------------------------------------------------------------------------
+;;; Layout interface.
+
+;; Just arrange to populate the necessary slots on demand.
+(flet ((check-class-is-finalized (class)
+	 (unless (eq (sod-class-state class) :finalized)
+	   (error "Class ~S is not finalized" class))))
+    (macrolet ((define-layout-slot (slot (class) &body body)
+	       `(define-on-demand-slot sod-class ,slot (,class)
+		  (check-class-is-finalized ,class)
+		  ,@body)))
+    (define-layout-slot %ilayout (class)
+      (compute-ilayout class))
+    (define-layout-slot effective-methods (class)
+      (compute-effective-methods class))
+    (define-layout-slot vtables (class)
+      (compute-vtables class))))
+
 ;;;----- That's all, folks --------------------------------------------------