knaveofdiamonds
1/6/2007 4:15:00 PM
Hi
I'm fairly new to this "meta-programming" thing, so excuse me if I get
my terminology wrong. Is there any way of getting access to the
exisiting context when using class << obj or otherwise creating a
singleton method?
For example of what I mean - I have a method that returns a Proc:
def foo()
local_var = "Bar"
Proc.new { local_var }
end
x = foo()
x.call --> returns "Bar", 'remembering' the local context
and I want to something similar with methods defined using class <<
obj:
class MyObject
end
def foo(my_object_instance)
local_var = "Bar"
class << my_object_instance
define_method(:a_method) { local_var }
end
end
o = MyObject.new
foo(o)
o.a_method --> throws an error, complaining about missing local
variable
If I just wanted to assign this method to the class then I think I
could do the following in foo:
my_object_instance.class.send(:define_method, :a_method) { local_var }
But I want to define a singleton method, and I don't think you can get
access to an object instance's virtual class in a similar way?
Any help with this much appreciated,
TIA
Roland