diff --git a/nucleus/utils/defer.h b/nucleus/utils/defer.h
new file mode 100644
index 00000000..a61e351c
--- /dev/null
+++ b/nucleus/utils/defer.h
@@ -0,0 +1,41 @@
+/*****************************************************************************
+ * Copyright (C) 2026 Matthias Huerbe
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *****************************************************************************/
+
+ #pragma once
+
+#ifndef DEFER_CONCAT_INTERNAL
+#define DEFER_CONCAT_INTERNAL(x, y) x##y
+#endif
+#ifndef DEFER_CONCAT
+#define DEFER_CONCAT(x, y) DEFER_CONCAT_INTERNAL(x, y)
+#endif
+
+#if defined(_MSC_VER)
+#define DEFER_FORCEINLINE __forceinline
+#else
+#define DEFER_FORCEINLINE inline __attribute__((always_inline))
+#endif
+
+namespace InternalDefer {
+template <typename F>
+struct Deferrer : F {
+  DEFER_FORCEINLINE constexpr Deferrer(F&& f) : F(static_cast<F&&>(f)) {}
+  DEFER_FORCEINLINE constexpr ~Deferrer() { F::operator()(); }
+};
+}
+
+#define defer [[maybe_unused]] const ::InternalDefer::Deferrer DEFER_CONCAT(_defer_, __COUNTER__) = [&](void) -> void