From 7caaf6453b7b1f58d953729380d596b2d9b27835 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Wed, 1 Oct 2014 20:38:22 -0700
Subject: Added support for tensor reductions and concatenations

---
 .../Eigen/CXX11/src/Tensor/TensorFunctors.h        | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 unsupported/Eigen/CXX11/src/Tensor/TensorFunctors.h

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

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorFunctors.h b/unsupported/Eigen/CXX11/src/Tensor/TensorFunctors.h
new file mode 100644
index 000000000..92984336c
--- /dev/null
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorFunctors.h
@@ -0,0 +1,62 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_CXX11_TENSOR_TENSOR_FUNCTORS_H
+#define EIGEN_CXX11_TENSOR_TENSOR_FUNCTORS_H
+
+namespace Eigen {
+namespace internal {
+
+// Standard reduction functors
+template <typename T> struct SumReducer
+{
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE SumReducer() : m_sum(0) { }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void reduce(const T t) {
+    m_sum += t;
+  }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T finalize() const {
+    return m_sum;
+  }
+
+ private:
+  T m_sum;
+};
+
+template <typename T> struct MaxReducer
+{
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE MaxReducer() : m_max((std::numeric_limits<T>::min)()) { }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void reduce(const T t) {
+    if (t > m_max) { m_max = t; }
+  }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T finalize() const {
+    return m_max;
+  }
+
+ private:
+  T m_max;
+};
+
+template <typename T> struct MinReducer
+{
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE MinReducer() : m_min((std::numeric_limits<T>::max)()) { }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void reduce(const T t) {
+    if (t < m_min) { m_min = t; }
+  }
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T finalize() const {
+    return m_min;
+  }
+
+ private:
+  T m_min;
+};
+
+} // end namespace internal
+} // end namespace Eigen
+
+#endif // EIGEN_CXX11_TENSOR_TENSOR_FUNCTORS_H
-- 
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