hashmap.h

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#ifndef HASHMAP_H_
#define HASHMAP_H_
 
#include <stdbool.h>
#include <stddef.h>
 
typedef struct HashNode {
  void* key;   
  void* value; 
  struct HashNode*
      next; 
} HashNode;
 
typedef struct {
  HashNode** buckets;  
  size_t bucket_count; 
  size_t key_size;     
  size_t value_size;   
  size_t size;         
  unsigned long (*hash_fn)(
      void*); 
  int (*cmp_fn)(void*, void*); 
} HashMap;
 
void hashmap_init(HashMap* map, size_t bucket_count, size_t key_size,
                  size_t value_size, unsigned long (*hash_fn)(void*),
                  int (*cmp_fn)(void*, void*));
 
void hashmap_destroy(HashMap* map);
 
bool hashmap_insert(HashMap* map, void* key, const void* data);
 
bool hashmap_remove(HashMap* map, void* key);
 
bool hashmap_update(HashMap* map, void* key, const void* new_data);
 
void* hashmap_get(HashMap* map, void* key);
 
int hashmap_size(const HashMap* map);
 
#endif  // HASHMAP_H_