=begin
    rubymacros - a macro preprocessor for ruby
    Copyright (C) 2008, 2016  Caleb Clausen

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
=end

class WeakKeyHash<Hash
  def initialize(&block)
    super
  end


  def [](key)
    super key.__id__
  end

  def []=(key,val)
    ObjectSpace.define_finalizer(key,&method :delete)
    super key.__id__,val
  end

  #dunno how many more methods will actually work...
end
