1 files changed, 54 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_ghash.h b/source/blender/blenlib/BLI_ghash.h
index 11dee5df57d..d2f2bcc95e4 100644
--- a/source/blender/blenlib/BLI_ghash.h
+++ b/source/blender/blenlib/BLI_ghash.h
@@ -37,6 +37,7 @@
 
 struct GHash;
 typedef struct GHash GHash;
+typedef struct GHashIterator GHashIterator;
 
 typedef unsigned int	(*GHashHashFP)		(void *key);
 typedef int				(*GHashCmpFP)		(void *a, void *b);
@@ -50,6 +51,59 @@ void	BLI_ghash_insert	(GHash *gh, void *key, void *val);
 void*	BLI_ghash_lookup	(GHash *gh, void *key);
 int		BLI_ghash_haskey	(GHash *gh, void *key);
 
+int		BLI_ghash_size		(GHash *gh);
+
+/* *** */
+
+	/**
+	 * Create a new GHashIterator. The hash table must not be mutated
+	 * while the iterator is in use, and the iterator will step exactly
+	 * BLI_ghash_size(gh) times before becoming done.
+	 * 
+	 * @param gh The GHash to iterate over.
+	 * @return Pointer to a new DynStr.
+	 */
+GHashIterator*	BLI_ghashIterator_new		(GHash *gh);
+	/**
+	 * Free a GHashIterator.
+	 *
+	 * @param ghi The iterator to free.
+	 */
+void			BLI_ghashIterator_free		(GHashIterator *ghi);
+
+	/**
+	 * Retrieve the key from an iterator.
+	 *
+	 * @param ghi The iterator.
+	 * @return The key at the current index, or NULL if the 
+	 * iterator is done.
+	 */
+void*			BLI_ghashIterator_getKey	(GHashIterator *ghi);
+	/**
+	 * Retrieve the value from an iterator.
+	 *
+	 * @param ghi The iterator.
+	 * @return The value at the current index, or NULL if the 
+	 * iterator is done.
+	 */
+void*			BLI_ghashIterator_getValue	(GHashIterator *ghi);
+	/**
+	 * Steps the iterator to the next index.
+	 *
+	 * @param ghi The iterator.
+	 */
+void			BLI_ghashIterator_step		(GHashIterator *ghi);
+	/**
+	 * Determine if an iterator is done (has reached the end of
+	 * the hash table).
+	 *
+	 * @param ghi The iterator.
+	 * @return True if done, False otherwise.
+	 */
+int				BLI_ghashIterator_isDone	(GHashIterator *ghi);
+
+/* *** */
+
 unsigned int	BLI_ghashutil_ptrhash	(void *key);
 int				BLI_ghashutil_ptrcmp	(void *a, void *b);