From: Russell Fulton <r.fulton@...>
Date: 2006-08-15T07:56:28+09:00
Subject: problems with dup and clone...

In the snippet of code below hosts holds a set of class instances for 
each host in a monitoring program.  There are some special host that are 
default entries for unix, windows and other types of systems.

We get the name of the machine to be monitored into $mach and see if we 
have an entry for it, if we don't then we use one of the defaults.



     if ! host then
	if type = type_of_host( filename ) then
	  host = hosts[mach] =  hosts[ "default-#{type}"].clone
	else
	  host = hosts[mach] = hosts[ "default"].clone
	end
	host.name = mach
      end

I have tried both dup and clone to copy the default objects but I always 
seem to end up with the original object in host.

The symptom is that when the second machine uses the default entry it 
gets the same copy as the first one.

I have printed out host and hosts[ "default-#{type}"]:


#<#<Class:0xb7537bc4>:0xb73e5a00>
#<#<Class:0xb7537bc4>:0xb73e599c>

Clearly I'm missing something important!

Russell



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