From ab7be57c4a634adfa5e62391549e10053f1a5e2e Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Sun, 2 Jul 2017 12:48:17 -0500
Subject: [PATCH] Deprecate ParpackSolver::Shift

---
 include/deal.II/lac/parpack_solver.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/deal.II/lac/parpack_solver.h b/include/deal.II/lac/parpack_solver.h
index 2280f686c8..fcc4b449ca 100644
--- a/include/deal.II/lac/parpack_solver.h
+++ b/include/deal.II/lac/parpack_solver.h
@@ -203,6 +203,11 @@ public:
 
   /**
    * Auxiliary class to represent <code>A-sigma*B</code> operator.
+   *
+   * @deprecated: Use LinearOperator to create a shifted operator by hand:
+   * <code>
+   *   const auto shift = linear_operator(A) - sigma * linear_operator(B);
+   * </code>
    */
   template <typename MatrixType>
   class Shift : public dealii::Subscriptor
@@ -245,7 +250,8 @@ public:
     const MatrixType &A;
     const MatrixType &B;
     const double sigma;
-  };
+
+  } DEAL_II_DEPRECATED;
 
   /**
    * Standardized data struct to pipe additional data to the solver, should it
-- 
2.39.5