value: New function value_swap.

diff --git a/src/data/value.h b/src/data/value.h
index a28b1855bb1ee2acc0fae1a28e2660ac9330ab3d..046a9a3aa638a5e69b77bbecca8f8447e30d820b 100644 (file)
--- a/src/data/value.h
+++ b/src/data/value.h
@@ -78,6 +78,8 @@ bool value_is_resizable (const union value *, int old_width, int new_width);
 bool value_needs_resize (int old_width, int new_width);
 void value_resize (union value *, int old_width, int new_width);
 
+static inline void value_swap (union value *, union value *);
+
 struct pool;
 void value_init_pool (struct pool *, union value *, int width);
 void value_resize_pool (struct pool *, union value *,
@@ -180,4 +182,13 @@ value_copy (union value *dst, const union value *src, int width)
     memcpy (dst->long_string, src->long_string, width);
 }
 
+/* Exchanges the contents of A and B. */
+static inline void
+value_swap (union value *a, union value *b)
+{
+  union value tmp = *a;
+  *a = *b;
+  *b = tmp;
+}
+
 #endif /* data/value.h */