From 85f88b909b46cdf6799710f7912145c96eecc3ed Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Mon, 14 May 2018 19:16:42 -0700
Subject: [PATCH] Add a swap function that swaps contents of references.

---
 include/refcount.h | 4 ++++
 src/refcount.c     | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/include/refcount.h b/include/refcount.h
index c6c1ed8..bd6a046 100644
--- a/include/refcount.h
+++ b/include/refcount.h
@@ -83,6 +83,10 @@ void libab_ref_free(libab_ref* ref);
  * Copies this reference, thereby increasing the reference count.
  */
 void libab_ref_copy(const libab_ref* ref, libab_ref* into);
+/**
+ * Swaps the contents of two references.
+ */
+void libab_ref_swap(libab_ref* left, libab_ref* right);
 /**
  * Function that can be passed in to refcount to simply use free
  * when the refcount reaches 0.
diff --git a/src/refcount.c b/src/refcount.c
index 93a2963..92a638f 100644
--- a/src/refcount.c
+++ b/src/refcount.c
@@ -57,6 +57,13 @@ void libab_ref_copy(const libab_ref* ref, libab_ref* into) {
     memcpy(into, ref, sizeof(*ref));
 }
 
+void libab_ref_swap(libab_ref* left, libab_ref* right) {
+    libab_ref tmp;
+    tmp = *left;
+    *left = *right;
+    *right = tmp;
+}
+
 void libab_ref_data_free(void* data) { free(data); }
 
 void* libab_ref_get(const libab_ref* ref) {