class DEBUGGER__::Session

def delete_bp arg = nil
  case arg
  when nil
    @bps.each{|key, bp| bp.delete}
    @bps.clear
  else
    del_bp = nil
    iterate_bps{|key, bp, i| del_bp = bp if i == arg}
    if del_bp
      del_bp.delete
      @bps.delete del_bp.key
      return [arg, del_bp]
    end
  end
end