From: Travis Whitton <whitton@...>
Date: 2003-09-16T04:08:25+09:00
Subject: Re: Problem Dynamically Loading a Module

Guy,
Thanks very much! That solved my problem perfectly. I love the Ruby community.

Travis

In article <200309151635.h8FGZgT05555@moulon.inra.fr>, ts wrote:
>>>>>> "T" == Travis Whitton <whitton@atlantic.net> writes:
> 
> 
>  Try this
> 
>T> class DynamicInclude
>T>   def initialize(dynmod)
>T>     DynamicInclude.load_module(dynmod)
> 
>        extend(Object.const_get(dynmod.to_s))
> 
>T>   end
> 
>T>   def DynamicInclude.load_module(modname)
>T>     load "#{modname}.rb"
>T>     include Object.const_get(modname.to_s)
> 
>   you don't need this include
> 
>T>   end
>T> end
> 
>  Now if you are sure that these previous module don't exist you can write
> 
> svg% cat b.rb
> #!/usr/bin/ruby
> 
> class DynamicInclude
>    def initialize(dynmod)
>       DynamicInclude.load_module(dynmod)
>       extend(Object.instance_eval { remove_const(dynmod.to_s) })
>    end
> 
>    def DynamicInclude.load_module(modname)
>       load "#{modname}.rb"
>    end
> end
> 
> d = DynamicInclude.new("Hello")
> d.greeting() # prints Hello
> e = DynamicInclude.new("Goodbye")
> e.greeting() # prints Goodbye
> d.greeting() # prints Goodbye
> svg% 
> 
> svg% b.rb
> Hello
> Goodbye
> Hello
> svg% 
> 
>  The load is made in Object, then the constant is removed to don't pollute
>  Object 
> 
> 
> Guy Decoux
>