CollectorPolicy() :

  {- -------------------------------------------
  (1) フィールドの初期化
      ---------------------------------------- -}

        _min_alignment(1),
        _max_alignment(1),
        _initial_heap_byte_size(0),
        _max_heap_byte_size(0),
        _min_heap_byte_size(0),
        _size_policy(NULL),
        _should_clear_all_soft_refs(false),
        _all_soft_refs_clear(false)
      {}