another deduction guide

TheNumbat · TheNumbat · commit 5b55c69bb8f6 · 2024-03-12T13:56:41.000-04:00
diff --git a/rpp/opt.h b/rpp/opt.h
@@ -7,6 +7,12 @@
 
 namespace rpp {
 
+template<typename T>
+struct Opt;
+
+template<typename T>
+Opt(T) -> Opt<T>;
+
 template<typename T>
 struct Opt {
 
