From 0ea7ab4f623864c82163d106cc93c8a97e4baac6 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Thu, 31 Mar 2016 14:44:55 -0700
Subject: Hashing was only officially introduced in c++11. Therefore only
 define an implementation of the hash function for float16 if c++11 is
 enabled.

---
 Eigen/src/Core/arch/CUDA/Half.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Eigen/src/Core/arch/CUDA/Half.h')

diff --git a/Eigen/src/Core/arch/CUDA/Half.h b/Eigen/src/Core/arch/CUDA/Half.h
index 70050358c..212aa0d5d 100644
--- a/Eigen/src/Core/arch/CUDA/Half.h
+++ b/Eigen/src/Core/arch/CUDA/Half.h
@@ -415,12 +415,14 @@ using ::sqrt;
 using ::floor;
 using ::ceil;
 
+#if __cplusplus > 199711L
 template <>
 struct hash<Eigen::half> {
   size_t operator()(const Eigen::half& a) const {
     return std::hash<unsigned short>()(a.x);
   }
 };
+#endif
 
 } // end namespace std
 
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