From: Eduardo Lima Mitev <elima@igalia.com>
Date: Fri, 23 Oct 2015 14:31:41 +0000 (+0200)
Subject: util: Add list_is_singular() helper function
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fb3b5669cee85781b603f612228387e9a2e4120f;p=mesa.git

util: Add list_is_singular() helper function

Returns whether the list has exactly one element.

Reviewed-by: Matt Turner <mattst88@gmail.com>
---

diff --git a/src/util/list.h b/src/util/list.h
index b98ce59ff77..066f9b8dfe5 100644
--- a/src/util/list.h
+++ b/src/util/list.h
@@ -99,6 +99,14 @@ static inline bool list_empty(struct list_head *list)
    return list->next == list;
 }
 
+/**
+ * Returns whether the list has exactly one element.
+ */
+static inline bool list_is_singular(const struct list_head *list)
+{
+   return list->next != NULL && list->next->next == list;
+}
+
 static inline unsigned list_length(struct list_head *list)
 {
    struct list_head *node;