only trigger the if action is not null during walk or destroy

src/hash/hash.c

@@ -34,14 +34,6 @@ hashCtor(void * _this, va_list * params)
 	return 0;
 }
 
-static
-inline
-void
-tDelete(const void * node, const int depth)
-{
-	TR_delete(node);
-}
-
 static
 void
 hashDtor(void * _this)

src/tree/destroy.c

@@ -46,7 +46,9 @@ TR_treeDestroy(TR_Tree * this, TR_TreeAction action)
             
             TR_Tree parent = TR_TREE_PARENT(node);
             
-            action(node->data, depth);
+			if (action) {
+				action(node->data, depth);
+			}
             
             previous = node;
 			TR_delete(node);

src/tree/walk.c

@@ -38,7 +38,9 @@ TR_treeWalk(TR_Tree this, TR_TreeAction action)
 		}
 
 		if (NULL == TR_TREE_LEFT(node) || previous == TR_TREE_LEFT(node)) {
-			action(node->data, depth);
+			if (action) {
+				action(node->data, depth);
+			}
 			previous = node;
 
 			if (NULL != TR_TREE_RIGHT(node)) {

trdata.h

@@ -11,13 +11,13 @@
 #define HAVE_MEMORY_H 1
 
 /* Define to 1 if you have the `memset' function. */
-#define HAVE_MEMSET 1
+/* #undef HAVE_MEMSET */
 
 /* Define to 1 if you have the <stdarg.h> header file. */
 #define HAVE_STDARG_H 1
 
 /* Define to 1 if stdbool.h conforms to C99. */
-#define HAVE_STDBOOL_H 1
+/* #undef HAVE_STDBOOL_H */
 
 /* Define to 1 if you have the <stdint.h> header file. */
 #define HAVE_STDINT_H 1