From 366394485b04c93f56dd94f9df9e140da8b9d612 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Thu, 9 Jul 2015 15:42:30 -0500
Subject: [PATCH] Add references between C++11 and the LA Operators.

---
 doc/doxygen/headers/c++11.h       | 15 ++++++++++++++-
 doc/doxygen/headers/laoperators.h |  3 ++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/doc/doxygen/headers/c++11.h b/doc/doxygen/headers/c++11.h
index 2ab29d33fd..1445a26f4e 100644
--- a/doc/doxygen/headers/c++11.h
+++ b/doc/doxygen/headers/c++11.h
@@ -1,6 +1,6 @@
 // ---------------------------------------------------------------------
 //
-// Copyright (C) 2014 by the deal.II authors
+// Copyright (C) 2014, 2015 by the deal.II authors
 //
 // This file is part of the deal.II library.
 //
@@ -99,4 +99,17 @@
  * There are variants of these functions that provide iterator ranges
  * for all cells (not just the active ones) and for cells on individual
  * levels.
+ *
+ *
+ * <h3>Things that are only enabled if your compiler supports C++11</h3>
+ *
+ * There is a small number of places inside deal.II where we allow ourselves
+ * the use of C++11 because it makes things so much simpler. These features
+ * are simply not available if your compiler does not support C++11, but this
+ * does not affect the usability of the remainder of deal.II.
+ *
+ * Specifically, these places are:
+ * - The LinearOperator class and all associated functions such as
+ *   linear_operator(), null_operator(), and everything else that is part of
+ *   the LAOperators documentation module.
  */
diff --git a/doc/doxygen/headers/laoperators.h b/doc/doxygen/headers/laoperators.h
index 00db2735b9..0aba9b3698 100644
--- a/doc/doxygen/headers/laoperators.h
+++ b/doc/doxygen/headers/laoperators.h
@@ -23,7 +23,8 @@
  * If deal.II is configured with C++11 support (i.e.,
  * <code>DEAL_II_WITH_CXX11=ON</code> or <code>DEAL_II_WITH_CXX14=ON</code>
  * during configuration) a versatile mechanism for storing the concept of a
- * linear operator is available.
+ * linear operator is available. (For questions about C++11, see
+ * @ref CPP11 .)
  *
  * This is done with a LinearOperator class that, similarly to the abstract
  * MATRIX interface, defines a minimal interface for <i>applying</i> a
-- 
2.39.5