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Versions: 47
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Contents
Enumerator = Enumerable::Enumerator unless Object.const_defined? :Enumerator # Standard in ruby 1.9
unless (Enumerator.new{} rescue false)
require 'backports/tools/alias_method_chain'
# new with block, standard in Ruby 1.9
class Enumerator
# A simple class which allows the construction of Enumerator from a block
class Yielder
def initialize(&block)
@final_block = block
end
def yield(*arg)
@final_block.call(*arg)
end
def <<(*arg)
@final_block.call(*arg)
self
end
end
class GeneratorBP # Avoid conflict with 1.8's ::Generator class
def initialize(&block)
@main_block = block
end
def each(&block)
@main_block.call(Yielder.new(&block))
end
end
def initialize_with_optional_block(*arg, &block)
return initialize_without_optional_block(*arg, &nil) unless arg.empty? # Ruby 1.9 apparently ignores the block if any argument is present
initialize_without_optional_block(GeneratorBP.new(&block))
end
Backports.alias_method_chain self, :initialize, :optional_block
end
end
Version data entries
47 entries across 47 versions & 4 rubygems