From: Rich Kilmer <rich@...>
Date: 2001-12-04T06:46:20+09:00
Subject: [ruby-talk:27378] RE:  Selecting class based on external information



> -----Original Message-----
> From: Jeff Putsch [mailto:putsch@hf.mxim.com]
> Sent: Monday, December 03, 2001 4:25 PM
> To: ruby-talk ML
> Subject: [ruby-talk:27371] Selecting class based on external information
> 
> 
> Howdy,
> 
> I'm trying to select the class for an instance variable based on external
> information and cannot figure out how. For example:
> 
>    class Host
>       # variables and routines common to all hosts, default values for
>       # OS specific things
>    end
>    
>    class SunOS < Host
>       # overrides for OS specific things
>    end 
>    
>    # main routine would do this...
>    
>    OSname = `/bin/uname -s`.chomp
>    
>    myHost = OSname.new # on a Solaris system this should
>                        # be equivalent to doing "myHost = SunOS.new"


try: myHost = eval(OSname+".new")


> 
> The initialization of "myHost" is where I run into trouble. I can 
> not figure
> out how to do this. I'm sure Ruby has some "magic" to get this done, but
> it's beyond me ... 
> 
> Jeff.
> -- 
> Jeff Putsch                       Email: putsch@mxim.com
> Maxim Integrated Products        Office: (503)547-2037
> High Frequency CAD Engineering