From e5a72bce36601aa9c088f3d4b4ed433c42aa03c8 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Tue, 25 Nov 2025 12:43:57 -0500
Subject: [PATCH] xo-interpreter: implement variable lookup

---
 include/xo/alloc/Object.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/xo/alloc/Object.hpp b/include/xo/alloc/Object.hpp
index 73a60edd..c8772db9 100644
--- a/include/xo/alloc/Object.hpp
+++ b/include/xo/alloc/Object.hpp
@@ -39,6 +39,10 @@ namespace xo {
         template <typename S>
         gc_ptr(const gc_ptr<S> & x) : ptr_{x.ptr()} {}
 
+        /** runtime downcast. shorthand for dynamic_cast<T*> **/
+        template <typename S>
+        static gc_ptr<T> from(const gc_ptr<S> & x) { return gc_ptr<T>{dynamic_cast<T*>(x.ptr())}; }
+
         /** convenience for static asserts **/
         static constexpr bool is_gc_ptr = true;
         /** see also: xo/refcnt/Refcounted.hpp **/