27 lines
1.1 KiB
C
27 lines
1.1 KiB
C
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// -----------------------------------------------------------------------------
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// factory of handle ids, based on code by randy gaul (PD/Zlib licensed)
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// - rlyeh, public domain
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//
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// [src] http://www.randygaul.net/wp-content/uploads/2021/04/handle_table.cpp
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// [ref] http://bitsquid.blogspot.com.es/2011/09/managing-decoupling-part-4-id-lookup.html
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// [ref] http://glampert.com/2016/05-04/dissecting-idhashindex/
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// [ref] https://github.com/nlguillemot/dof/blob/master/viewer/packed_freelist.h
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// [ref] https://gist.github.com/pervognsen/ffd89e45b5750e9ce4c6c8589fc7f253
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// convert between hard refs (pointers) and weak refs (ids)
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uintptr_t id_make(void *ptr);
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void * id_handle(uintptr_t id);
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void id_dispose(uintptr_t id);
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bool id_valid(uintptr_t id);
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// configuration:
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// ideally, these two should be 32 each. they were changed to fit our OBJHEADER bits
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#ifndef ID_INDEX_BITS
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#define ID_INDEX_BITS 16
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#endif
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#ifndef ID_COUNT_BITS
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#define ID_COUNT_BITS 3
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#endif
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// you cannot change this one: the number of ID_DATA_BITS you can store in a handle depends on ID_COUNT_BITS
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#define ID_DATA_BITS (64-ID_COUNT_BITS)
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