From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Wed, 13 Nov 2013 12:31:26 +0000 (+0000)
Subject: Add a note.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1923ae8c61139d167e098606714845aadababc6c;p=dealii-svn.git

Add a note.

git-svn-id: https://svn.dealii.org/trunk@31637 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/include/deal.II/lac/block_sparse_matrix.h b/deal.II/include/deal.II/lac/block_sparse_matrix.h
index e5f91ad22b..75d3c5811e 100644
--- a/deal.II/include/deal.II/lac/block_sparse_matrix.h
+++ b/deal.II/include/deal.II/lac/block_sparse_matrix.h
@@ -186,8 +186,11 @@ public:
    * sparsity patterns of the
    * parameter.
    *
-   * The elements of the matrix are
-   * set to zero by this function.
+   * You have to make sure that the lifetime of the sparsity structure is at
+   * least as long as that of this matrix or as long as reinit(const
+   * SparsityPattern &) is not called with a new sparsity structure.
+   *
+   * The elements of the matrix are set to zero by this function.
    */
   virtual void reinit (const BlockSparsityPattern &sparsity);
 //@}