class Debug
	class << self
		
		def trace_methods klass
			klass.instance_methods(false).each do |m|
				klass.class_eval do		
					alias_method :"old_#{m}", m		
					define_method m.to_sym do |*args|
						begin
							time = Time.now
							p [m.to_sym, :start]
							result = send :"old_#{m}", *args							
						ensure
							p [m.to_sym, :end, time - Time.now]
						end
						return result
					end
				end
			end
		end
		
		
	end
end