Specialization for Eigen math traits.

Author: MaxSagebaum

documentation/Changelog.md

@@ -1,6 +1,10 @@
 Changelog {#Changelog}
 ===========================
 
+### v??? - ???
+ - Features:
+   * Specialization for Eigen math traits.
+
 ### v3.1.0 - 2026-02-02
  - Features:
    * It is now possible to define custom tape evaluators for all CoDiPack tapes. The evaluators have access to the full

include/codi.hpp

@@ -87,6 +87,7 @@
 #if CODI_EnableEigen
   #include "codi/tools/helpers/linearSystem/eigenLinearSystem.hpp"
   #include "codi/tools/lowlevelFunctions/linearAlgebra/matrixMatrixMultiplication.hpp"
+  #include "codi/traits/eigenTraits.hpp"
 #endif
 
 #if CODI_EnableEnzyme

include/codi/traits/eigenTraits.hpp

@@ -0,0 +1,49 @@
+/*
+ * CoDiPack, a Code Differentiation Package
+ *
+ * Copyright (C) 2015-2026 Chair for Scientific Computing (SciComp), RPTU University Kaiserslautern-Landau
+ * Homepage: http://scicomp.rptu.de
+ * Contact:  Prof. Nicolas R. Gauger (codi@scicomp.uni-kl.de)
+ *
+ * Lead developers: Max Sagebaum, Johannes Blühdorn (SciComp, RPTU University Kaiserslautern-Landau)
+ *
+ * This file is part of CoDiPack (http://scicomp.rptu.de/software/codi).
+ *
+ * CoDiPack is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * CoDiPack is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU General Public License for more details.
+ * You should have received a copy of the GNU
+ * General Public License along with CoDiPack.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * For other licensing options please contact us.
+ *
+ * Authors:
+ *  - SciComp, RPTU University Kaiserslautern-Landau:
+ *    - Max Sagebaum
+ *    - Johannes Blühdorn
+ *    - Former members:
+ *      - Tim Albring
+ */
+#pragma once
+
+#include "expressionTraits.hpp"
+#include "../expressions/activeType.hpp"
+
+#include <Eigen/src/Core/MathFunctions.h>
+
+namespace Eigen {
+  namespace internal {
+    template<typename T>
+    struct global_math_functions_filtering_base<T, codi::ExpressionTraits::EnableIfExpression<T>> {
+        using type = codi::ActiveType<typename T::ADLogic>;
+    };
+  }
+}