From: Phillip Mobley <phillipmobley2@gmail.com>
Date: Thu, 23 Jul 2020 03:00:56 +0000 (-0400)
Subject: Added in pre-processor check to see if signals is already defined. If so, alert the... 
X-Git-Tag: v9.3.0-rc1~1253^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F10724%2Fhead;p=dealii.git

Added in pre-processor check to see if signals is already defined. If so, alert the user with a potential fix
---

diff --git a/include/deal.II/grid/tria.h b/include/deal.II/grid/tria.h
index d5d7652f1c..1398971ca9 100644
--- a/include/deal.II/grid/tria.h
+++ b/include/deal.II/grid/tria.h
@@ -45,6 +45,13 @@
 
 DEAL_II_NAMESPACE_OPEN
 
+#ifdef signals
+#  error \
+    "The data type signals is already defined. You are most likely using the QT library \
+and using the signals keyword. You can either #include the Qt headers (or any conflicting headers) \
+after the deal.ii headers or you can define the QT_NO_KEYWORDS marco and use the Q_SIGNALS macro."
+#endif
+
 // Forward declarations
 #ifndef DOXYGEN
 template <int dim, int spacedim>
diff --git a/include/deal.II/multigrid/multigrid.h b/include/deal.II/multigrid/multigrid.h
index d8ed117e1b..8661943393 100644
--- a/include/deal.II/multigrid/multigrid.h
+++ b/include/deal.II/multigrid/multigrid.h
@@ -36,6 +36,13 @@
 
 DEAL_II_NAMESPACE_OPEN
 
+#ifdef signals
+#  error \
+    "The data type signals is already defined. You are most likely using the QT library \
+and using the signals keyword. You can either #include the Qt headers (or any conflicting headers) \
+after the deal.ii headers or you can define the QT_NO_KEYWORDS marco and use the Q_SIGNALS macro."
+#endif
+
 /*!@addtogroup mg */
 /*@{*/