yous/raheui

# encoding: utf-8

module Raheui
  # Stack class for Aheui.
  class Stack < Store
    # Delegates push, pop to @store.
    delegate [:push, :pop] => :@store

    # Push the last element to Stack.
    def push_dup
      push(@store.last) if size > 0
    end

    # Swap the last two elements of Stack.
    def swap
      @store[-1], @store[-2] = @store[-2], @store[-1] if size > 1
    end
  end
end