From 486c6c555fe0bc38ff6f5890ae3b0f2f723b080b Mon Sep 17 00:00:00 2001
From: qijun <qijun1994@hotmail.com>
Date: Tue, 18 Apr 2017 15:23:33 +0800
Subject: [PATCH] fix build error with clang

---
 paddle/gserver/gradientmachines/GradientMachine.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/paddle/gserver/gradientmachines/GradientMachine.h b/paddle/gserver/gradientmachines/GradientMachine.h
index bc2f2f85635..f9c82a2bef8 100644
--- a/paddle/gserver/gradientmachines/GradientMachine.h
+++ b/paddle/gserver/gradientmachines/GradientMachine.h
@@ -134,9 +134,7 @@ public:
     backward(callback);
   }
 
-  virtual Argument getLayerOutput(const std::string& layerName) {
-    return *((Argument*)nullptr);
-  }
+  virtual Argument getLayerOutput(const std::string& layerName) = 0;
 
   // see comment in Layer.h for the function with the same name
   virtual void resetState() {}
-- 
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