CylindricalManifold: make member variable const.

diff --git a/include/deal.II/grid/manifold_lib.h b/include/deal.II/grid/manifold_lib.h
index 105ccc3f93cd7f46e8b80dc2df606a2d70b32562..989bc3a2357a6492479bba7edcb5c2e527b7666a 100644 (file)
--- a/include/deal.II/grid/manifold_lib.h
+++ b/include/deal.II/grid/manifold_lib.h
@@ -471,7 +471,7 @@ private:
   /**
    * Relative tolerance to measure zero distances.
    */
-  double tolerance;
+  const double tolerance;
 };
 
 /**