mirror of
https://github.com/nineties/planckforth
synced 2025-01-13 08:01:10 +01:00
46 lines
1.2 KiB
Forth
46 lines
1.2 KiB
Forth
\ planckforth -
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\ Copyright (C) 2021 nineties
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( === Hash Table === )
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include lib/bitscan.fs
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include lib/array.fs
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private{
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create prime_numbers
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5 , 11 , 17 , 37 , 67 , 131 , 257 , 521 , 1031 ,
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2053 , 4099 , 8209 , 16411 , 32771 , 65537 , 131101 ,
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0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,
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0 , 0 , 0 ,
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struct
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ptr% field table>bucket
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ptr% field table>hash ( hash function )
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ptr% field table>equal ( equal function for keys )
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ptr% field table>entries ( list of entries )
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int% field table>size ( number of entries )
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end-struct table%
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struct
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ptr% field entry>key
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ptr% field entry>value
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ptr% field entry>sibling ( pointer to the next entry in bucket )
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ptr% field entry>next ( pointer to the next entry in entries )
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int% field entry>hash ( the hash value )
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end-struct entry%
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: make-table-with-size ( hash equal n -- tbl )
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bitscan-reverse cells prime_numbers + @ ( n to bucket size )
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make-array ( allocate bucket )
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( hash equal bucket )
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table% %allocate throw
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tuck table>bucket !
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tuck table>equal !
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tuck table>hash !
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0 over table>entries !
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0 over table>size !
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; export
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}private
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