Simulating a Subclass of Fixnum : Fixnum extension « Number « Ruby






  1. Ruby
  2. Number
  3. Fixnum extension

Simulating a Subclass of Fixnum


require 'delegate'
class HexNumber < DelegateClass(Fixnum)
  # The string representations of this class are hexadecimal numbers.
  def to_s
    sign = self < 0 ? "-" : ""
    hex = abs.to_s(16)
    "#{sign}0x#{hex}"
  end

  def inspect
    to_s
  end
end

HexNumber.new(10)                             # => 0xa
HexNumber.new(-10)                            # => -0xa
HexNumber.new(1000000)                        # => 0xf4240
HexNumber.new(1024 ** 10)                     # => 0x10000000000000000000000000

HexNumber.new(10).succ                        # => 11
HexNumber.new(10) * 2                         # => 20








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