module M
So, how can I do that?
I think I solved it:
module S
def self.included(other)
methods = instance_methods(false)
other.module_eval do
methods.each do |name|
name = name.to_sym
base.send :define_method, name, instance_method(name)
end
end
end
end
Now I want to add methods to C1 and C2 and whatever other class includes M.
So, how can I do that?
There are at least these two possible approaches
add methods to M
create another module S and include it in all classes inheriting M
2b. same as 2 but insert S only in the inheritance hierarchy of
classes that directly include M
#!/bin/env ruby
module M
def m
“Mmmmh!”
end
end
class A
include M
end
class B
include M
end
approach 1
module M
def late
“late”
end
end
puts A.new.late, B.new.late
approach 2
module S
def even_later
“even_later”
end
end
ObjectSpace.each_object(Class) do |cl|
if cl.ancestors.include?(M) && !cl.ancestors.include?(S)
cl.class_eval { include S }
end
end
puts A.new.even_later, B.new.even_later
approach 2b
module S2
def x
“X”
end
end
ObjectSpace.each_object(Class) do |cl|
a = cl.ancestors
i = a.index(M)
if i && a[1…i].all? {|c| not Class === c}
cl.class_eval { include S2 }
end
end
puts A.new.x, B.new.x
Cheers
robert
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