From 63abb35dfd9d57ae6a49dc7c129a3d0a1b6ab315 Mon Sep 17 00:00:00 2001
From: Erik Schultheis <erik.schultheis@aalto.fi>
Date: Mon, 29 Nov 2021 22:51:26 +0000
Subject: [PATCH] SFINAE'ing away non-const overloads if selfAdjoint/triangular
 view is not referring to an lvalue

---
 Eigen/src/Core/SelfAdjointView.h  | 4 ++--
 Eigen/src/Core/TriangularMatrix.h | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Eigen/src/Core/SelfAdjointView.h b/Eigen/src/Core/SelfAdjointView.h
index 97c2a1939..9e6026304 100644
--- a/Eigen/src/Core/SelfAdjointView.h
+++ b/Eigen/src/Core/SelfAdjointView.h
@@ -219,9 +219,9 @@ template<typename MatrixType_, unsigned int UpLo> class SelfAdjointView
     typedef SelfAdjointView<typename MatrixType::TransposeReturnType,TransposeMode> TransposeReturnType;
      /** \sa MatrixBase::transpose() */
     EIGEN_DEVICE_FUNC
-    inline TransposeReturnType transpose()
+    template<class Dummy=int>
+    inline TransposeReturnType transpose(typename internal::enable_if<Eigen::internal::is_lvalue<MatrixType>::value, Dummy*>::type = nullptr)
     {
-      EIGEN_STATIC_ASSERT_LVALUE(MatrixType)
       typename MatrixType::TransposeReturnType tmp(m_matrix);
       return TransposeReturnType(tmp);
     }
diff --git a/Eigen/src/Core/TriangularMatrix.h b/Eigen/src/Core/TriangularMatrix.h
index e9a4cae19..34c072f32 100644
--- a/Eigen/src/Core/TriangularMatrix.h
+++ b/Eigen/src/Core/TriangularMatrix.h
@@ -265,9 +265,9 @@ template<typename MatrixType_, unsigned int Mode_> class TriangularView
     typedef TriangularView<typename MatrixType::TransposeReturnType,TransposeMode> TransposeReturnType;
      /** \sa MatrixBase::transpose() */
     EIGEN_DEVICE_FUNC
-    inline TransposeReturnType transpose()
+    template<class Dummy=int>
+    inline TransposeReturnType transpose(typename internal::enable_if<Eigen::internal::is_lvalue<MatrixType>::value, Dummy*>::type = nullptr)
     {
-      EIGEN_STATIC_ASSERT_LVALUE(MatrixType)
       typename MatrixType::TransposeReturnType tmp(m_matrix);
       return TransposeReturnType(tmp);
     }