lib/veritas/aggregate.rb in veritas-0.0.5 vs lib/veritas/aggregate.rb in veritas-0.0.6

@@ -2,12 +2,15 @@
 
 module Veritas
 
   # Abstract class for aggregate functions
   class Aggregate
+    extend Comparator
     include AbstractClass, Immutable, Visitable, Operation::Unary
 
+    compare :operand
+
     # Return the default accumulator
     #
     # @example
     #   default = Aggregate.default
     #
@@ -92,9 +95,24 @@
     # @return [Class<Attribute>]
     #
     # @api public
     def type
       raise NotImplementedError, "#{self.class}#type must be implemented"
+    end
+
+    # Compare the aggregate with other aggregate for equivalency
+    #
+    # @example
+    #   aggregate == other  # => true or false
+    #
+    # @param [Aggregate] other
+    #   the other aggregate to compare with
+    #
+    # @return [Boolean]
+    #
+    # @api public
+    def ==(other)
+      cmp?(__method__, other)
     end
 
   private
 
     # Extract the value from the operand or tuple