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require 'active_support' class Class def class_inheritable_attributes(*syms, &block) eigenclass = class << self; self; end syms.each do |sym| eigenclass.send :define_method, sym do |*values| if value = values.first value = block.call value if block write_inheritable_attribute sym, value else read_inheritable_attribute sym end end class_eval <<-EOS def #{sym} self.class.read_inheritable_attribute :#{sym} end EOS end end alias :class_inheritable_attribute :class_inheritable_attributes end ## examples # class Base # class_inheritable_attribute(:root) { |root| Pathname.new(root).realpath } # end # class A < Base # root '.' # end # >> Base.root # => nil # >> a = A.new # => #<A:0xb78a2c64> # >> a.root # => #<Pathname:/home/vjt/code/ecole/lib> # >> A.root # => #<Pathname:/home/vjt/code/ecole/lib> # >> A.root '.' # => #<Pathname:/home/vjt/code/ecole/lib> # >> A.root '..' # => #<Pathname:/home/vjt/code/ecole> # vjt@openssl.it

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