--- /dev/null
+#
+# concat_is_bool.rb
+#
+
+module Puppet::Parser::Functions
+ newfunction(:concat_is_bool, :type => :rvalue, :doc => <<-EOS
+Returns true if the variable passed to this function is a boolean.
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "concat_is_bool(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size != 1
+
+ type = arguments[0]
+
+ result = type.is_a?(TrueClass) || type.is_a?(FalseClass)
+
+ return result
+ end
+end
+
+# vim: set ts=2 sw=2 et :