1 files changed, 22 insertions, 0 deletions
diff --git a/lib/erubis/util.rb b/lib/erubis/util.rb
new file mode 100644
index 0000000..d1611ce
--- /dev/null
+++ b/lib/erubis/util.rb
@@ -0,0 +1,22 @@
+##
+## $Release:$
+## $Copyright$
+##
+
+module Kernel
+
+  ##
+  ## raise NotImplementedError
+  ##
+  def not_implemented     #:doc:
+    backtrace = caller()
+    method_name = (backtrace.shift =~ /`(\w+)'$/) && $1
+    mesg = "class #{self.class.name} must implement abstract method '#{method_name}()'."
+    #mesg = "#{self.class.name}##{method_name}() is not implemented."
+    err = NotImplementedError.new mesg
+    err.set_backtrace backtrace
+    raise err
+  end
+  private :not_implemented
+
+end