Use non-deprecated name for AffineConstraints in step-52.

diff --git a/examples/step-52/step-52.cc b/examples/step-52/step-52.cc
index 77ef88d5e13ddd96817606ba37c44d0c9bbd6382..26a3006efca0c85c461c82a16d86c948ca0c7494 100644 (file)
--- a/examples/step-52/step-52.cc
+++ b/examples/step-52/step-52.cc
@@ -131,7 +131,7 @@ namespace Step52
 
     DoFHandler<2> dof_handler;
 
-    ConstraintMatrix constraint_matrix;
+    AffineConstraints<double> constraint_matrix;
 
     SparsityPattern sparsity_pattern;