define TimeStepStage in a dedicated header

Author: thelfer

include/CMakeLists.txt

@@ -31,6 +31,7 @@ mgis_header(MGIS/MaterialProperty OutOfBoundsPolicy.hxx)
 mgis_header(MGIS/MaterialProperty MaterialPropertyFctPtr.hxx)
 mgis_header(MGIS/MaterialProperty MaterialProperty.hxx)
 mgis_header(MGIS/Behaviour Hypothesis.hxx)
+mgis_header(MGIS/Behaviour TimeStepStage.hxx)
 mgis_header(MGIS/Behaviour RotationMatrix.hxx)
 mgis_header(MGIS/Behaviour RotationMatrix.ixx)
 mgis_header(MGIS/Behaviour Variable.hxx)

include/MGIS/Behaviour/MaterialFunctionManager.hxx

@@ -16,6 +16,7 @@
 #include "MGIS/Function/SpaceConcept.hxx"
 #include "MGIS/Function/SharedSpace.hxx"
 #include "MGIS/Function/Function.hxx"
+#include "MGIS/Behaviour/TimeStepStage.hxx"
 #include "MGIS/Behaviour/MaterialDataManager.hxx"
 
 namespace mgis::behaviour {
@@ -95,14 +96,6 @@ namespace mgis::behaviour {
     std::shared_ptr<const Behaviour> behaviour_ptr;
   };
 
-  enum TimeStepStage {
-    BEGINNING_OF_TIME_STEP,
-    END_OF_TIME_STEP,
-  };
-
-  inline constexpr auto bts = TimeStepStage::BEGINNING_OF_TIME_STEP;
-  inline constexpr auto ets = TimeStepStage::END_OF_TIME_STEP;
-
   // this variable is a workaround Visual Studio 2022 limitation
   // on defining default value for non-type template argument
   template <size_type N>

include/MGIS/Behaviour/TimeStepStage.hxx

@@ -0,0 +1,25 @@
+/*!
+ * \file   MGIS/Behaviour/TimeStepStage.hxx
+ * \brief
+ * \author Thomas Helfer
+ * \date   24/01/2026
+ */
+
+#ifndef LIB_MGIS_BEHAVIOUR_TIMESTEPSTAGE_HXX
+#define LIB_MGIS_BEHAVIOUR_TIMESTEPSTAGE_HXX
+
+namespace mgis::behaviour {
+
+  /*!
+   * \brief an enumeration describing either the beginning of the time step or
+   * the end of the time step
+   */
+  enum struct TimeStepStage { BEGINNING_OF_TIME_STEP, END_OF_TIME_STEP };
+  //! \brief variable associated with the beginning of the time step
+  inline constexpr auto bts = TimeStepStage::BEGINNING_OF_TIME_STEP;
+  //! \brief variable associated with the end of the time step
+  inline constexpr auto ets = TimeStepStage::END_OF_TIME_STEP;
+
+}  // end of namespace mgis::behaviour
+
+#endif /* LIB_MGIS_BEHAVIOUR_TIMESTEPSTAGE_HXX */