1 files changed, 12 insertions, 5 deletions
diff --git a/libdimension/interior.c b/libdimension/interior.c
index 9f9201d..0accb79 100644
--- a/libdimension/interior.c
+++ b/libdimension/interior.c
@@ -26,8 +26,10 @@ dmnsn_interior *
 dmnsn_new_interior()
 {
   dmnsn_interior *interior = dmnsn_malloc(sizeof(dmnsn_interior));
-  interior->ior     = 1.0;
-  interior->free_fn = NULL;
+  interior->ior       = 1.0;
+  interior->free_fn   = NULL;
+  interior->refcount  = dmnsn_malloc(sizeof(unsigned int));
+  *interior->refcount = 1;
   return interior;
 }
 
@@ -36,9 +38,14 @@ void
 dmnsn_delete_interior(dmnsn_interior *interior)
 {
   if (interior) {
-    if (interior->free_fn) {
-      (*interior->free_fn)(interior->ptr);
+    if (*interior->refcount <= 1) {
+      if (interior->free_fn) {
+        (*interior->free_fn)(interior->ptr);
+      }
+      free(interior->refcount);
+      free(interior);
+    } else {
+      --*interior->refcount;
     }
-    free(interior);
   }
 }