From 6a7841eb099e8f92bb2c321e87e2b1f4724ddaed Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Wed, 2 Nov 2011 15:28:45 +0100
Subject: [PATCH] added an union in the dict.h structure to store 64 bit
 integers directly into hash table entries.

---
 src/dict.c |  3 +--
 src/dict.h | 16 +++++++++++-----
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/dict.c b/src/dict.c
index 24001fdd..f98fdd0e 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -270,7 +270,7 @@ int dictAdd(dict *d, void *key, void *val)
     if ((index = _dictKeyIndex(d, key)) == -1)
         return DICT_ERR;
 
-    /* Allocates the memory and stores key */
+    /* Allocate the memory and store the new entry */
     ht = dictIsRehashing(d) ? &d->ht[1] : &d->ht[0];
     entry = zmalloc(sizeof(*entry));
     entry->next = ht->table[index];
@@ -297,7 +297,6 @@ int dictReplace(dict *d, void *key, void *val)
         return 1;
     /* It already exists, get the entry */
     entry = dictFind(d, key);
-    /* Free the old value and set the new one */
     /* Set the new value and free the old one. Note that it is important
      * to do that in this order, as the value may just be exactly the same
      * as the previous one. In this context, think to reference counting,
diff --git a/src/dict.h b/src/dict.h
index 74bcd2aa..31cd6564 100644
--- a/src/dict.h
+++ b/src/dict.h
@@ -33,6 +33,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <stdint.h>
+
 #ifndef __DICT_H
 #define __DICT_H
 
@@ -44,7 +46,11 @@
 
 typedef struct dictEntry {
     void *key;
-    void *val;
+    union {
+        void *val;
+        uint64_t u64;
+        int64_t i64;
+    } v;
     struct dictEntry *next;
 } dictEntry;
 
@@ -90,13 +96,13 @@ typedef struct dictIterator {
 /* ------------------------------- Macros ------------------------------------*/
 #define dictFreeEntryVal(d, entry) \
     if ((d)->type->valDestructor) \
-        (d)->type->valDestructor((d)->privdata, (entry)->val)
+        (d)->type->valDestructor((d)->privdata, (entry)->v.val)
 
 #define dictSetHashVal(d, entry, _val_) do { \
     if ((d)->type->valDup) \
-        entry->val = (d)->type->valDup((d)->privdata, _val_); \
+        entry->v.val = (d)->type->valDup((d)->privdata, _val_); \
     else \
-        entry->val = (_val_); \
+        entry->v.val = (_val_); \
 } while(0)
 
 #define dictFreeEntryKey(d, entry) \
@@ -118,7 +124,7 @@ typedef struct dictIterator {
 #define dictHashKey(d, key) (d)->type->hashFunction(key)
 
 #define dictGetEntryKey(he) ((he)->key)
-#define dictGetEntryVal(he) ((he)->val)
+#define dictGetEntryVal(he) ((he)->v.val)
 #define dictSlots(d) ((d)->ht[0].size+(d)->ht[1].size)
 #define dictSize(d) ((d)->ht[0].used+(d)->ht[1].used)
 #define dictIsRehashing(ht) ((ht)->rehashidx != -1)