hash.h

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#include "stmt/statement.h"
#include "timerange.h"

typedef struct _HashTable HashTable;

typedef struct {
    Node node;
    int isnil;
} TKey;

#define key2int(k)         ((unsigned int)(unsigned long)((k)->node.literal) )
#define equalkey(k1,k2)    ( !node_compare(&(k1)->node, &(k2)->node) )
#define isnilkey(k)        ((k)->isnil)
#define setnilkey(k)       (k)->isnil = 1
#define setkey(k,n)        (k)->isnil = 0; (k)->node = (n)

typedef struct safe_table safe_table;

typedef union {
    safe_table* up;
    TimeRange* tr;
} TValue;

#define isnilvalue(v)      ( (v)->up == NULL )
#define setnilvalue(v)     ((v)->up = NULL)

HashTable* hash_new(int hashsize);
void hash_free(HashTable *t);
TValue* hash_set(HashTable *t, const TKey *key);
const TValue* hash_get(HashTable *t, const TKey *key);
int hash_next(HashTable *t, TKey **key, TValue **value);

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