From 7ad55a4e76f334e5b1f86eb45fff5abb74210de8 Mon Sep 17 00:00:00 2001
From: xuwei06 <xuwei06@baidu.com>
Date: Tue, 6 Sep 2016 23:08:19 -0700
Subject: [PATCH] Fix ThreadParameterUpdater

The reference return type causes ThreadParameterUpdater.cpp:123 seg fault under gcc5.4.

Change-Id: I7a1c155892722076a7cb48793b83d5ee525747d1
---
 paddle/trainer/ThreadParameterUpdater.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/trainer/ThreadParameterUpdater.h b/paddle/trainer/ThreadParameterUpdater.h
index f47d3b08c1..d8a7a5dd4f 100644
--- a/paddle/trainer/ThreadParameterUpdater.h
+++ b/paddle/trainer/ThreadParameterUpdater.h
@@ -79,7 +79,7 @@ protected:
   // The update function for after update operations, such as averager.
   void threadTraverse(const ParameterOptimizer::TraverseCallback& callback,
                       int tid, size_t numThreads, Parameter* para);
-  typedef std::function<const ParameterOptimizer::TraverseCallback&(Parameter*)>
+  typedef std::function<const ParameterOptimizer::TraverseCallback(Parameter*)>
     GetTraverseCallback;
   void traverse(GetTraverseCallback getTraverseCallback);
 };
-- 
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