Puppet users - Nov 2014 - Puppet custom function for arithmetic operation

Hello,

Just trying to write a custom function. Basically looking to pass an 
argument from manifest and value should get calculated.

module Puppet::Parser::Functions
         newfunction(:shmmax, :type => :rvalue) do |args|
                 def shmmax(args)
                         product = args * 1024 * 1024 * 1024
                         return product
                 end
         end
end


@ foo.pp
     $shmmax_variable = shmmax(2)
     sysctl { "kernel.shmmax"        :       val =>
$shmmax_variable }

In this case I'm expecting a value of 2147483648 for kernel.shmmax in 
sysctl.conf file

Its just fails, Any pointer what is wrong here ?

Regards,
Ashish Jaiswal.

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