immediate.rb

# -*- encoding: us-ascii -*-

##
# Mixin used to identify classes which have no memory storage.

module ImmediateValue
  def singleton_methods(all=true)
    []
  end

  def private_singleton_methods
    []
  end
  private :private_singleton_methods

  def protected_singleton_methods
    []
  end
  private :protected_singleton_methods

  def taint
    self
  end

  def tainted?
    false
  end

  def freeze
    self
  end

  def frozen?
    false
  end

  def dup
    raise TypeError, "can't dup #{self.class.name}"
  end
end

class NilClass
  include ImmediateValue
end

class FalseClass
  include ImmediateValue
end

class TrueClass
  include ImmediateValue
end

class Symbol
  include ImmediateValue
end

class Fixnum
  include ImmediateValue
end