Move only function helper

nano/lib/function.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <utility>
+
+namespace nano
+{
+// TODO: Replace with std::move_only_function in C++23
+template <typename F>
+auto wrap_move_only (F && f)
+{
+	using fn_type = decltype (std::function{ std::declval<F> () });
+	auto ptr = std::make_shared<std::decay_t<F>> (std::forward<F> (f));
+	return fn_type ([ptr] (auto &&... args) {
+		return (*ptr) (std::forward<decltype (args)> (args)...);
+	});
+}
+}