class Enumerator::Product

# File lib/backports/3.2.0/enumerator/product.rb, line 44
def initialize(*enums)
  @__enums = enums
end

# File lib/backports/3.2.0/enumerator/product.rb, line 50
def each(&block)
  return self unless block
  __execute(block, [], @__enums)
  self
end

# File lib/backports/3.2.0/enumerator/product.rb, line 81
def rewind
  @__enums.each do |enum|
    enum.rewind if enum.respond_to?(:rewind)
  end
  self
end

# File lib/backports/3.2.0/enumerator/product.rb, line 69
def size
  total_size = 1
  @__enums.each do |enum|
    return nil unless enum.respond_to?(:size)
    size = enum.size
    return size if size == 0 || size == nil || size == Float::INFINITY || size == -Float::INFINITY
    return nil unless size.is_a?(Integer)
    total_size *= size
  end
  total_size
end

# File lib/backports/3.2.0/enumerator/product.rb, line 56
def __execute(block, values, enums)
  if enums.empty?
    block.yield values
  else
    enum, *enums = enums
    enum.each do |val|
      __execute(block, [*values, val], enums)
    end
  end
  nil
end

# File lib/backports/3.2.0/enumerator/product.rb, line 88
        def initialize_copy(other)
  return self if equal?(other)

  raise TypeError unless Product === other

  super(other)

  other_enums = other.instance_variable_get(:@__enums)

  raise ArgumentError, "uninitialized product" unless other_enums

  @__enums = other_enums

  self
end