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Bitvectors are all used...

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Posted by AlaricX   (23 posts)  [Biography] bio
Date Sat 25 May 2002 04:47 PM (UTC)
Message
i am getting frustrated, because i need to add room_flags but i am out of bitvectors, i just now tried a
typedef enum
{
}
containing all of them, but is there a better way to do this to get more than 32 room flags?
--Alaric X
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Posted by Nick Gammon   Australia  (22,973 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Sun 26 May 2002 02:09 AM (UTC)
Message
The latest SMAUG uses "extended bitvectors" which are supposed to give you about 4 times that many.

Look for this stuff in mud.h ...


/*
 * Defines for extended bitvectors
 */
#ifndef INTBITS
  #define INTBITS   32
#endif
#define XBM     31  /* extended bitmask   ( INTBITS - 1 )   */
#define RSV     5   /* right-shift value  ( sqrt(XBM+1) )   */
#define XBI     4   /* integers in an extended bitvector    */
#define MAX_BITS    XBI * INTBITS
/*
 * Structure for extended bitvectors -- Thoric
 */
struct extended_bitvector
{
    int     bits[XBI];
};

...


/*
 * Here are the extended bitvector macros:
 */
#define xIS_SET(var, bit)   ((var).bits[(bit) >> RSV] & 1 << ((bit) & XBM))
#define xSET_BIT(var, bit)  ((var).bits[(bit) >> RSV] |= 1 << ((bit) & XBM))
#define xSET_BITS(var, bit) (ext_set_bits(&(var), &(bit)))
#define xREMOVE_BIT(var, bit)   ((var).bits[(bit) >> RSV] &= ~(1 << ((bit) & XBM
)))
#define xREMOVE_BITS(var, bit)  (ext_remove_bits(&(var), &(bit)))
#define xTOGGLE_BIT(var, bit)   ((var).bits[(bit) >> RSV] ^= 1 << ((bit) & XBM))
#define xTOGGLE_BITS(var, bit)  (ext_toggle_bits(&(var), &(bit)))
#define xCLEAR_BITS(var)    (ext_clear_bits(&(var)))
#define xIS_EMPTY(var)      (ext_is_empty(&(var)))
#define xHAS_BITS(var, bit) (ext_has_bits(&(var), &(bit)))
#define xSAME_BITS(var, bit)    (ext_same_bits(&(var), &(bit)))


- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by AlaricX   (23 posts)  [Biography] bio
Date Reply #2 on Sun 26 May 2002 05:22 AM (UTC)
Message
like the ones for objject types or object flags? will they still work right if i convery the current ones to extended bitvectors? or would i need to change all the code? am example of how to change these two example values would be greatly appreciated: (these are just examples)

#define ROOM_DARK BV00
#define ROOM_DEATH BV01

thanks in advance.
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Posted by Nick Gammon   Australia  (22,973 posts)  [Biography] bio   Forum Administrator
Date Reply #3 on Mon 27 May 2002 01:04 AM (UTC)
Message
For the defines, instead of:


#define ROOM_DARK BV00
#define ROOM_DEATH BV01

you would have:


#define ROOM_DARK 0
#define ROOM_DEATH 1



To test, instead of:


if ( IS_SET(pRoomIndex->room_flags, ROOM_DARK) )


you would have:


if ( xIS_SET(pRoomIndex->room_flags, ROOM_DARK) )


For the room flags, instead of:


int room_flags;


you would have:


EXT_BV room_flags;


To read the bits, instead of:


room_flags = fread_number (fp);


you would have:


room_flags = fread_bitvector (fp);


... and so on. It will be a big job. :)

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by AlaricX   (23 posts)  [Biography] bio
Date Reply #4 on Mon 27 May 2002 05:33 AM (UTC)
Message
argh... :( too bad. thanks for the help anyway.
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