Solved an ownership issue in DRC which popped up after universal DRC nodes got deleted.

src/drc/drc/built-in-macros/_drc_complex_ops.rb

@@ -232,15 +232,15 @@ class DRCOpNode
   attr_accessor :description
   attr_accessor :engine
   
-  def initialize(engine, node = nil)
-    @node = node
+  def initialize(engine, &factory)
+    @factory = factory
     self.engine = engine
     self.description = "Basic"
   end
   
   def create_node(cache)
     n = cache[self.object_id]
-    if !n
+    if !n || n.destroyed?
       n = self.do_create_node(cache)
       cache[self.object_id] = n
     end
@@ -248,7 +248,7 @@ class DRCOpNode
   end
   
   def do_create_node(cache)
-    @node
+    @factory.call
   end
   
   def dump(indent)
@@ -362,8 +362,8 @@ CODE
         return self.inverted
       else
         # TODO: what if the expression isn't region?
-        empty = RBA::CompoundRegionOperationNode::new_empty(RBA::CompoundRegionOperationNode::ResultType::Region)
-        DRCOpNodeCase::new(@engine, [ self, DRCOpNode::new(@engine, empty), @engine.primary ])
+        empty = DRCOpNode::new(@engine) { RBA::CompoundRegionOperationNode::new_empty(RBA::CompoundRegionOperationNode::ResultType::Region) }
+        DRCOpNodeCase::new(@engine, [ self, empty, @engine.primary ])
       end
     end
   end

src/drc/drc/built-in-macros/_drc_cop_integration.rb

@@ -476,7 +476,7 @@ module DRC
 
         layer.requires_region
 
-        res = DRCOpNode::new(self, RBA::CompoundRegionOperationNode::new_secondary(layer.data))
+        res = DRCOpNode::new(self) { RBA::CompoundRegionOperationNode::new_secondary(layer.data) }
         res.description = "secondary"
         return res
 
@@ -493,7 +493,7 @@ module DRC
     # is called on.
     
     def primary
-      res = DRCOpNode::new(self, RBA::CompoundRegionOperationNode::new_primary)
+      res = DRCOpNode::new(self) { RBA::CompoundRegionOperationNode::new_primary }
       res.description = "primary"
       return res
     end
@@ -520,7 +520,7 @@ module DRC
     # @/code
     
     def foreign
-      res = DRCOpNode::new(self, RBA::CompoundRegionOperationNode::new_foreign)
+      res = DRCOpNode::new(self) { RBA::CompoundRegionOperationNode::new_foreign }
       res.description = "foreign"
       return res
     end
@@ -1555,10 +1555,12 @@ CODE
 
     def _make_node(arg)
       if arg.is_a?(DRCLayer)
-        arg = DRCOpNode::new(self, RBA::CompoundRegionOperationNode::new_secondary(arg.data))
-        arg.description = "secondary"
+        node = DRCOpNode::new(self) { RBA::CompoundRegionOperationNode::new_secondary(arg.data) }
+        node.description = "secondary"
+        return node
+      else
+        return arg
       end
-      arg
     end
 
   end