From 7dd6655a9ecb997a2a4f216154229de2814212ec Mon Sep 17 00:00:00 2001
From: Zhihao Yuan <lichray@gmail.com>
Date: Sat, 16 Nov 2019 22:14:14 -0600
Subject: [PATCH] Avoid extra copy made by initializer_list

---
 include/argparse.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/argparse.hpp b/include/argparse.hpp
index 253cea9..c965f9a 100644
--- a/include/argparse.hpp
+++ b/include/argparse.hpp
@@ -416,7 +416,7 @@ public:
   // Parameter packed add_parents method
   // Accepts a variadic number of ArgumentParser objects
   template <typename... Targs> void add_parents(const Targs &... Fargs) {
-    for (auto &tParentParser : {Fargs...}) {
+    for (const ArgumentParser &tParentParser : {std::ref(Fargs)...}) {
       for (auto &tArgument : tParentParser.mPositionalArguments) {
         auto it =
             mPositionalArguments.insert(cend(mPositionalArguments), tArgument);