Rename IdentityMatrix into IdentityMatrixTag

dune/curvedgeometry/localgeometry.hh

@@ -7,11 +7,11 @@ namespace Dune {
 namespace Impl {
 
 // Placeholder type for a trivial identity matrix without any functionality
-struct IdentityMatrix {};
+struct IdentityMatrixTag {};
 
 // multiplication of an identity-matrix with any real matrix
 template <class K, int n, int m>
-const FieldMatrix<K,n,m>& AB(const IdentityMatrix& A, const FieldMatrix<K,n,m>& B)
+const FieldMatrix<K,n,m>& AB(const IdentityMatrixTag& A, const FieldMatrix<K,n,m>& B)
 {
   return B;
 }
@@ -33,7 +33,7 @@ struct DefaultLocalGeometry
   }
 
   template <class LocalCoordinate>
-  Impl::IdentityMatrix jacobianTransposed(LocalCoordinate&& local) const
+  Impl::IdentityMatrixTag jacobianTransposed(LocalCoordinate&& local) const
   {
     return {};
   }