From 00566da2c6d059662771d2407366a9891162b9c3 Mon Sep 17 00:00:00 2001
From: Chester Leung <chester.leung@berkeley.edu>
Date: Sun, 11 Sep 2022 21:22:32 -0700
Subject: [PATCH] Remove reference parameter, instead pass by value to fix
 compile error. This error seemed to manifest when using gcc 11, but not when
 using gcc 7

---
 enclave/src/learner.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/enclave/src/learner.cc b/enclave/src/learner.cc
index a45a6b05c..a57a4d0e1 100644
--- a/enclave/src/learner.cc
+++ b/enclave/src/learner.cc
@@ -481,7 +481,7 @@ class LearnerConfiguration : public Learner {
         if (is_parameter(kv.first)) {
           auto parameter = get<Object const>(kv.second);
           std::transform(parameter.begin(), parameter.end(), std::back_inserter(keys),
-                         [](std::pair<std::string const&, Json const&> const& kv) {
+                         [](std::pair<std::string const&, Json const&> const kv) {
                            return kv.first;
                          });
         } else if (IsA<Object>(kv.second)) {