add fake struct to help with type checker

1 files changed, 10 insertions, 2 deletions

diff --git a/include/uns.h b/include/uns.h
index 93a859d..d88397c 100644
--- a/include/uns.h
+++ b/include/uns.h
@@ -38,6 +38,14 @@
 typedef UNS_WORD uns_word;
 typedef UNS_SIGNED_WORD uns_sword;
 
+/* This struct doesn't exist and is used to make a unique pointer for
+ * type checking.
+ *
+ * This pointer must be what was returned from an allocation (i.e. it points
+ * to the first byte but before any hidden header data).
+ */
+typedef struct uns_ptr *Uns_ptr;
+
 /** Doubly linked list used to
   *
   * 1) Store roots of the GC,
@@ -89,8 +97,8 @@ struct uns_gc {
 	 */
 	size_t (*len)(void *);
 
-	void (*record_set_ptr)(void *, size_t, void *);
-	void *(*record_get_ptr)(void *, size_t);
+	void (*record_set_ptr)(Uns_ptr, size_t, void *);
+	void *(*record_get_ptr)(Uns_ptr, size_t);
 };
 
 /** Add a root to the GC. The root must point to valid memory, or NULL. */