From 5c2179b6c30921d1c5ed5d6762be1f0e0e14493d Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@gmail.com>
Date: Mon, 23 May 2022 17:36:03 +0000
Subject: [PATCH] Avoid ambiguous Tensor comparison operators for C++20
 compatibility

---
 .../Eigen/CXX11/src/Tensor/TensorBase.h       | 24 +++++++++----------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorBase.h b/unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
index 3e07a6f99..abe8db2a3 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorBase.h
@@ -519,36 +519,36 @@ class TensorBase<Derived, ReadOnlyAccessors>
     }
 
     // Comparisons and tests.
-    template<typename OtherDerived> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+    template<typename OtherDerived, int OtherAccessLevel> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
     const TensorCwiseBinaryOp<internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_LT>, const Derived, const OtherDerived>
-    operator<(const OtherDerived& other) const {
+    operator<(const TensorBase<OtherDerived, OtherAccessLevel>& other) const {
       return binaryExpr(other.derived(), internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_LT>());
     }
-    template<typename OtherDerived> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+    template<typename OtherDerived, int OtherAccessLevel> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
     const TensorCwiseBinaryOp<internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_LE>, const Derived, const OtherDerived>
-    operator<=(const OtherDerived& other) const {
+    operator<=(const TensorBase<OtherDerived, OtherAccessLevel>& other) const {
       return binaryExpr(other.derived(), internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_LE>());
     }
-    template<typename OtherDerived> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+    template<typename OtherDerived, int OtherAccessLevel> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
     const TensorCwiseBinaryOp<internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_GT>, const Derived, const OtherDerived>
-    operator>(const OtherDerived& other) const {
+    operator>(const TensorBase<OtherDerived, OtherAccessLevel>& other) const {
       return binaryExpr(other.derived(), internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_GT>());
     }
-    template<typename OtherDerived> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+    template<typename OtherDerived, int OtherAccessLevel> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
     const TensorCwiseBinaryOp<internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_GE>, const Derived, const OtherDerived>
-    operator>=(const OtherDerived& other) const {
+    operator>=(const TensorBase<OtherDerived, OtherAccessLevel>& other) const {
       return binaryExpr(other.derived(), internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_GE>());
     }
 
-    template<typename OtherDerived> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+    template<typename OtherDerived, int OtherAccessLevel> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
     const TensorCwiseBinaryOp<internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_EQ>, const Derived, const OtherDerived>
-    operator==(const OtherDerived& other) const {
+    operator==(const TensorBase<OtherDerived, OtherAccessLevel>& other) const {
       return binaryExpr(other.derived(), internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_EQ>());
     }
 
-    template<typename OtherDerived> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
+    template<typename OtherDerived, int OtherAccessLevel> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
     const TensorCwiseBinaryOp<internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_NEQ>, const Derived, const OtherDerived>
-    operator!=(const OtherDerived& other) const {
+    operator!=(const TensorBase<OtherDerived, OtherAccessLevel>& other) const {
       return binaryExpr(other.derived(), internal::scalar_cmp_op<Scalar, Scalar, internal::cmp_NEQ>());
     }