/usr/lib/ruby/1.8/ramaze/snippets/metaid.rb is in libramaze-ruby1.8 2010.06.18-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | # from http://whytheluckystiff.net/articles/seeingMetaclassesClearly.html
class Object
# The hidden singleton lurks behind everyone
def metaclass; class << self; self; end; end
def meta_eval &blk; metaclass.instance_eval(&blk); end
# Adds methods to a metaclass
def meta_def name, &blk
meta_eval { define_method name, &blk }
end
# Defines an instance method within a class
def class_def name, &blk
class_eval { define_method name, &blk }
end
end
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