hashtable: make more flexible

[Split by Brian Norris]

diff --git a/hashtable.h b/hashtable.h
index c4cf290d928cc4a2d6bea060d702db9b8ba820a3..e59a995fd92347a361a785a2d5e36c646b1a7656 100644 (file)
--- a/hashtable.h
+++ b/hashtable.h
@@ -15,12 +15,15 @@ template<typename _Key, typename _Val>
                struct hashlistnode<_Key,_Val> *next;
        };
 
-template<typename _Key, typename _Val, typename _KeyInt, int _Shift>
+/** Hashtable class.  By default it is snapshotting, but you can pass
+               in your own allocation functions. */
+
+template<typename _Key, typename _Val, typename _KeyInt, int _Shift, void * (* _malloc)(size_t)=malloc, void * (* _calloc)(size_t, size_t)=calloc, void (*_free)(void *)=free>
        class HashTable {
  public:
        HashTable(unsigned int initialcapacity=1024, double factor=0.5) {
                // Allocate space for the hash table
-               table = (struct hashlistnode<_Key,_Val> **) calloc(initialcapacity, sizeof(struct hashlistnode<_Key,_Val> *));
+               table = (struct hashlistnode<_Key,_Val> **) _calloc(initialcapacity, sizeof(struct hashlistnode<_Key,_Val> *));
                loadfactor = factor;
                capacity = initialcapacity;
                threshold = (unsigned int) (initialcapacity*loadfactor);
@@ -33,11 +36,27 @@ template<typename _Key, typename _Val, typename _KeyInt, int _Shift>
                        struct hashlistnode<_Key,_Val> * bin = table[i];
                        while(bin!=NULL) {
                                struct hashlistnode<_Key,_Val> * next=bin->next;
-                               free(bin);
+                               _free(bin);
                                bin=next;
                        }
                }
-               free(table);
+               _free(table);
+       }
+
+       void * operator new(size_t size) {
+               return _malloc(size);
+       }
+
+       void operator delete(void *p, size_t size) {
+               _free(p);
+       }
+
+       void * operator new[](size_t size) {
+               return _malloc(size);
+       }
+
+       void operator delete[](void *p, size_t size) {\
+               _free(p);
        }
 
        /** Reset the table to its initial state. */
@@ -46,7 +65,7 @@ template<typename _Key, typename _Val, typename _KeyInt, int _Shift>
                        struct hashlistnode<_Key,_Val> * bin = table[i];
                        while(bin!=NULL) {
                                struct hashlistnode<_Key,_Val> * next=bin->next;
-                               free(bin);
+                               _free(bin);
                                bin=next;
                        }
                }
@@ -74,7 +93,7 @@ template<typename _Key, typename _Val, typename _KeyInt, int _Shift>
                        search=search->next;
                }
 
-               struct hashlistnode<_Key,_Val> *newptr=(struct hashlistnode<_Key,_Val> *)malloc(sizeof(struct hashlistnode<_Key,_Val>));
+               struct hashlistnode<_Key,_Val> *newptr=(struct hashlistnode<_Key,_Val> *)_malloc(sizeof(struct hashlistnode<_Key,_Val>));
                newptr->key=key;
                newptr->val=val;
                newptr->next=ptr;
@@ -113,7 +132,7 @@ template<typename _Key, typename _Val, typename _KeyInt, int _Shift>
                struct hashlistnode<_Key,_Val> ** newtable;
                unsigned int oldcapacity = capacity;
 
-               if((newtable = (struct hashlistnode<_Key,_Val> **) calloc(newsize, sizeof(struct hashlistnode<_Key,_Val> *))) == NULL) {
+               if((newtable = (struct hashlistnode<_Key,_Val> **) _calloc(newsize, sizeof(struct hashlistnode<_Key,_Val> *))) == NULL) {
                        printf("Calloc error %s %d\n", __FILE__, __LINE__);
                        exit(-1);
                }
@@ -138,7 +157,7 @@ template<typename _Key, typename _Val, typename _KeyInt, int _Shift>
                        }
                }
 
-               free(oldtable);            //Free the memory of the old hash table
+               _free(oldtable);            //Free the memory of the old hash table
        }
 
  private: