lib/bmg/operator/shared/binary.rb in bmg-0.16.7 vs lib/bmg/operator/shared/binary.rb in bmg-0.17.0

@@ -1,17 +1,28 @@
 module Bmg
   module Operator
     module Binary
       include Operator
 
+      def bind(binding)
+        _with_operands(left.bind(binding), right.bind(binding))
+      end
+
     protected
 
-      attr_reader :left, :right
+      attr_accessor :left, :right
 
       def _visit(parent, visitor)
         visitor.call(self, parent)
         left.send(:_visit, self, visitor)
         right.send(:_visit, self, visitor)
+      end
+
+      def _with_operands(left, right)
+        dup.tap{|d|
+          d.left = left
+          d.right = right
+        }
       end
 
       def operands
         [left, right]
       end