lib/latinum/collection.rb in latinum-1.2.0 vs lib/latinum/collection.rb in latinum-1.3.0

@@ -55,9 +55,28 @@
 			end
 			
 			return self
 		end
 		
+		# Add something to this collection.
+		alias + <<
+		
+		# Subtract something from this collection.
+		def - other
+			self << -other
+		end
+		
+		# Allow negation of all values within the collection:
+		def -@
+			collection = self.class.new
+			
+			@resources.each do |key, value|
+				collection.resources[key] = -value
+			end
+			
+			return collection
+		end
+		
 		# Get a `Resource` for the given name:
 		def [] key
 			Resource.new(@resources[key], key)
 		end