From: ts <decoux@...>
Date: 2002-05-03T02:28:30+09:00
Subject: Re: Scope of Singleton Classes

>>>>> "J" == Jason Voegele <jason@jvoegele.com> writes:

J> def method_missing(operation, *args)
J>     op = lookup_operation(klass, operation) # slow
J>     class << self
J>         define_method(operation, args) do |*opargs|
J>             send_iiop_request(...)
J>         end
J>     end
J> end

 There is a stupid way to write it in 1.7.2, small problem with 1.6.7

pigeon% cat b.rb
#!/usr/bin/ruby
class ObjectProxy
   def self.defin(operation)
      define_method(operation) do |x|
         forward(operation, x)
      end
   end

   def method_missing(operation, *args)
      p "method_missing #{operation}"
      class << self; self end.send(:defin, operation)
      send(operation, *args)
   end

   def forward(operation, *args)
      p "forward #{operation} -- #{args.inspect}"
   end
end

obj = ObjectProxy.new
obj.foo
obj.foo(12)
obj.bar
obj.foo(12, 24)
obj.bar(36)
ObjectProxy.new.foo('a')
pigeon% 

pigeon% b.rb
"method_missing foo"
./b.rb:11:in `send': undefined method `defin' for ObjectProxy:Class (NameError)
        from ./b.rb:11:in `method_missing'
        from ./b.rb:21
pigeon% 

pigeon% ./ruby b.rb
"method_missing foo"
"forward foo -- [nil]"
"forward foo -- [12]"
"method_missing bar"
"forward bar -- [nil]"
"forward foo -- [[12, 24]]"
"forward bar -- [36]"
"method_missing foo"
"forward foo -- [\"a\"]"
pigeon% 



Guy Decoux