:: Btree_descr :: Btree_descr()

    {

    l_index = 0 ;

    l_data = 0 ;

    l_page = 0 ;

    h_descr = 0 ;

    };

:: Btree_page :: Btree_page()

    {

    };

:: Btree_index :: Btree_index()

    {

    };

:: Btree_data :: Btree_data()

    {

    };

:: Btree_pos :: Btree_pos()

    {

    r = 0 ;

    };

:: store_256 :: store_256()

    {

    c_L = 0 ;

    };

Btree :: Prefix :: Prefix()

    {

    };