added power_m_p struct

[[Imported from SVN: r2268]]

common/misc.hh

@@ -42,6 +42,28 @@ namespace Dune {
     return t*t;
   }
 
+  //! Calculates m^p at compile time
+  template <int m, int p>
+  struct Power_m_p
+  {
+    // power stores m^p
+    enum { power = (m * Power_m_p<m,p-1>::power ) };
+  };
+
+  // end of recursion via specialization
+  template <int m>
+  struct Power_m_p< m , 0>
+  {
+    // m^0 = 1
+    enum { power = 1 };
+  };
+
+  //********************************************************************
+  //
+  // generate filenames with timestep number in it
+  //
+  //********************************************************************
+
   /** \brief Generate filenames with timestep number in it */
   inline std::string genFilename(const std::string& path,
                                  const std::string& fn,