# File lib/prime.rb, line 335
def initialize(ubound = nil)
  @ubound = ubound
end

# File lib/prime.rb, line 367
def each
  return self.dup unless block_given?
  if @ubound
    last_value = nil
    loop do
      prime = succ
      break last_value if prime > @ubound
      last_value = yield prime
    end
  else
    loop do
      yield succ
    end
  end
end

# File lib/prime.rb, line 355
def next
  raise NotImplementedError, "need to define `next'"
end

# File lib/prime.rb, line 362
def rewind
  raise NotImplementedError, "need to define `rewind'"
end

# File lib/prime.rb, line 402
def size
  Float::INFINITY
end

# File lib/prime.rb, line 350
def succ
  raise NotImplementedError, "need to define `succ'"
end

# File lib/prime.rb, line 342
def upper_bound
  @ubound
end

# File lib/prime.rb, line 339
def upper_bound=(ubound)
  @ubound = ubound
end

# File lib/prime.rb, line 384
def with_index(offset = 0, &block)
  return enum_for(:with_index, offset) { Float::INFINITY } unless block
  return each_with_index(&block) if offset == 0

  each do |prime|
    yield prime, offset
    offset += 1
  end
end

# File lib/prime.rb, line 395
def with_object(obj)
  return enum_for(:with_object, obj) { Float::INFINITY } unless block_given?
  each do |prime|
    yield prime, obj
  end
end