48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#ifndef foohashmaphfoo
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#define foohashmaphfoo
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#include <stdbool.h>
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/* Pretty straightforward hash table implementation. As a minor
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* optimization a NULL hashmap object will be treated as empty hashmap
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* for all read operations. That way it is not necessary to
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* instantiate an object for each Hashmap use. */
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typedef struct Hashmap Hashmap;
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typedef unsigned (*hash_func_t)(const void *p);
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typedef int (*compare_func_t)(const void *a, const void *b);
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unsigned string_hash_func(const void *p);
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int string_compare_func(const void *a, const void *b);
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unsigned trivial_hash_func(const void *p);
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int trivial_compare_func(const void *a, const void *b);
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Hashmap *hashmap_new(hash_func_t hash_func, compare_func_t compare_func);
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void hashmap_free(Hashmap*);
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int hashmap_put(Hashmap *h, const void *key, void *value);
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void* hashmap_get(Hashmap *h, const void *key);
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void* hashmap_remove(Hashmap *h, const void *key);
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unsigned hashmap_size(Hashmap *h);
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bool hashmap_isempty(Hashmap *h);
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void *hashmap_iterate(Hashmap *h, void **state, const void **key);
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void *hashmap_iterate_backwards(Hashmap *h, void **state, const void **key);
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void *hashmap_steal_first(Hashmap *h);
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void* hashmap_first(Hashmap *h);
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void* hashmap_last(Hashmap *h);
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#define HASHMAP_FOREACH(e, h, state) \
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for ((state) = NULL, (e) = hashmap_iterate((h), &(state), NULL); (e); (e) = hashmap_iterate((h), &(state), NULL))
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#define HASHMAP_FOREACH_BACKWARDS(e, h, state) \
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for ((state) = NULL, (e) = hashmap_iterate_backwards((h), &(state), NULL); (e); (e) = hashmap_iterate_backwards((h), &(state), NULL))
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#endif
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