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Subject: Re: Hash Collisions

Author: Dave Gomboc

Date: 02:34:01 02/24/99

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On February 23, 1999 at 11:09:40, Robert Hyatt wrote:

>On February 23, 1999 at 04:58:30, Dave Gomboc wrote:
>
>>On February 22, 1999 at 11:14:14, Robert Hyatt wrote:
>>
>>>I'll try to figure out a way to post my values here if you are interested.
>>>64 * 12 isn't horribly big, but when you display them as 64 bit values, they
>>>are big. The main issue is how to initialize such an array in a portable
>>>way...  IE (BITBOARD ran[12][64] = {{1,2,3},{4,5,6}};  The numbers 1,2,3
>>>default to 'int' which is bad.  I don't know what to do for all compilers
>>>(IE 123ULL or (BITBOARD) 123)
>>
>>I don't know of a portable way to do this either.  My Rush Hour
>>(www.puzzles.com) software has "#if defined"s like crazy for all of the annoying
>>cases, e.g.
>>
>
>
>Cute bit of trivia.  Look on the outside of the Rush Hour box, and check
>out the names.  One of them dates back to Cray Blitz.  But I won't spoil
>the mystery just yet.
>
>:)

Mystery?  On my box, there is only one name!  The box says that Nob Yoshigahara
is the inventor of the game.  Perhaps there is a different box in Canada than in
the U.S.?  But I doubt it... there's no French on this box, there is just a
sticker with French text slapped on top of it, as if it was an afterthought.

>>/* MSVC 6.0 */
>>typedef unsigned __int64 bitboard;
>>const bitboard outside_edge = 0xFF818181818181FF;
>>
>>/* SGI MIPSpro 7.2.1 (with -64 switch) */
>>typedef unsigned long bitboard;
>>const bitboard outside_edge = 0xFF818181818181FF;
>>
>>/* g++ 2.7.2 */
>>typedef unsigned long long bitboard;
>>const bitboard outside_edge = 0xFF818181818181FFll;
>>
>>Of the three, I like SGI's setup the best.
>>
>>Dave Gomboc

BTW, if someone has a better way to do the above, please mention it. :-)

Dave Gomboc



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