From 58026905ae4a608abac33f59a782beae590a8371 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Wed, 25 May 2016 11:04:14 -0700
Subject: Added support for statically known lists of pairs of indices

---
 unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h b/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h
index cd04716bd..9ae97ba42 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorMeta.h
@@ -112,6 +112,20 @@ bool operator!=(const Tuple<U, V>& x, const Tuple<U, V>& y) {
 }
 
 
+// Can't use std::pairs on cuda devices
+template <typename Idx> struct IndexPair {
+  constexpr EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE IndexPair() : first(0), second(0) {}
+  constexpr EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE IndexPair(Idx f, Idx s) : first(f), second(s) {}
+
+  EIGEN_DEVICE_FUNC void set(IndexPair<Idx> val) {
+    first = val.first;
+    second = val.second;
+  }
+
+  Idx first;
+  Idx second;
+};
+
 
 #ifdef EIGEN_HAS_SFINAE
 namespace internal {
-- 
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