endian: add constant versions.

[ccan] / ccan / htable / htable.h

diff --git a/ccan/htable/htable.h b/ccan/htable/htable.h
index b68442972c78cb41146f2439267a2fb703a1e11c..ed668e7405ed84e819cec49b85f8186b85287933 100644 (file)
--- a/ccan/htable/htable.h
+++ b/ccan/htable/htable.h
@@ -1,25 +1,63 @@
+/* Licensed under LGPLv2+ - see LICENSE file for details */
 #ifndef CCAN_HTABLE_H
 #define CCAN_HTABLE_H
 #include "config.h"
+#include <stdint.h>
 #include <stdbool.h>
 #include <stdlib.h>
 
-struct htable;
+/**
+ * struct htable - private definition of a htable.
+ *
+ * It's exposed here so you can put it in your structures and so we can
+ * supply inline functions.
+ */
+struct htable {
+       size_t (*rehash)(const void *elem, void *priv);
+       void *priv;
+       unsigned int bits;
+       size_t elems, deleted, max, max_with_deleted;
+       /* These are the bits which are the same in all pointers. */
+       uintptr_t common_mask, common_bits;
+       uintptr_t perfect_bit;
+       uintptr_t *table;
+};
+
+/**
+ * HTABLE_INITIALIZER - static initialization for a hash table.
+ * @name: name of this htable.
+ * @rehash: hash function to use for rehashing.
+ * @priv: private argument to @rehash function.
+ *
+ * This is useful for setting up static and global hash tables.
+ *
+ * Example:
+ *     // For simplicity's sake, say hash value is contents of elem.
+ *     static size_t rehash(const void *elem, void *unused)
+ *     {
+ *             return *(size_t *)elem;
+ *     }
+ *     static struct htable ht = HTABLE_INITIALIZER(ht, rehash, NULL);
+ */
+#define HTABLE_INITIALIZER(name, rehash, priv)                         \
+       { rehash, priv, 0, 0, 0, 0, 0, -1, 0, 0, &name.perfect_bit }
 
 /**
- * htable_new - allocate a hash tree.
+ * htable_init - initialize an empty hash table.
+ * @ht: the hash table to initialize
  * @rehash: hash function to use for rehashing.
  * @priv: private argument to @rehash function.
  */
-struct htable *htable_new(size_t (*hash)(const void *elem, void *priv),
-                         void *priv);
+void htable_init(struct htable *ht,
+                size_t (*rehash)(const void *elem, void *priv), void *priv);
 
 /**
- * htable_free - dellocate a hash tree.
+ * htable_clear - empty a hash table.
+ * @ht: the hash table to clear
  *
  * This doesn't do anything to any pointers left in it.
  */
-void htable_free(const struct htable *);
+void htable_clear(struct htable *ht);
 
 /**
  * htable_rehash - use a hashtree's rehash function
@@ -29,7 +67,7 @@ void htable_free(const struct htable *);
 size_t htable_rehash(const void *elem);
 
 /**
- * htable_add - add a pointer into a hash tree.
+ * htable_add - add a pointer into a hash table.
  * @ht: the htable
  * @hash: the hash value of the object
  * @p: the non-NULL pointer
@@ -40,7 +78,7 @@ size_t htable_rehash(const void *elem);
 bool htable_add(struct htable *ht, size_t hash, const void *p);
 
 /**
- * htable_del - remove a pointer from a hash tree
+ * htable_del - remove a pointer from a hash table
  * @ht: the htable
  * @hash: the hash value of the object
  * @p: the pointer
@@ -126,7 +164,7 @@ void *htable_first(const struct htable *htable, struct htable_iter *i);
 void *htable_next(const struct htable *htable, struct htable_iter *i);
 
 /**
- * htable_delval - remove an iterated pointer from a hash tree
+ * htable_delval - remove an iterated pointer from a hash table
  * @ht: the htable
  * @i: the htable_iter
  *