From 4d5d1dc1de80021c0406a9ddb434de39f7a4f2e9 Mon Sep 17 00:00:00 2001
From: Fan Jiang <prof.fan@foxmail.com>
Date: Wed, 3 Jun 2020 13:29:19 -0400
Subject: [PATCH] Trying to fix old GCC

---
 gtsam/linear/VectorValues.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gtsam/linear/VectorValues.h b/gtsam/linear/VectorValues.h
index 5de34c194..9e60ff2aa 100644
--- a/gtsam/linear/VectorValues.h
+++ b/gtsam/linear/VectorValues.h
@@ -182,7 +182,7 @@ namespace gtsam {
     template<class... Args>
     inline std::pair<VectorValues::iterator, bool> emplace(Key j, Args&&... args) {
 #if ! defined(GTSAM_USE_TBB) || defined (TBB_GREATER_EQUAL_2020)
-      return values_.emplace(j, std::forward<Args>(args)...);
+      return values_.emplace(std::piecewise_construct, std::forward_as_tuple(j), std::forward_as_tuple(args...));
 #else
       return values_.insert(std::make_pair(j, Vector(std::forward<Args>(args)...)));
 #endif