From 4b6cfaf24e5314a87f1bc72e1ef82da21e0f962d Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Fri, 31 Oct 2014 13:48:20 -0500
Subject: [PATCH] Introduce a macro DEAL_II_VERSION_GTE.

---
 doc/news/changes.h               | 9 +++++++++
 include/deal.II/base/config.h.in | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/doc/news/changes.h b/doc/news/changes.h
index 7dc07cdaca..e7bc34b50b 100644
--- a/doc/news/changes.h
+++ b/doc/news/changes.h
@@ -325,6 +325,15 @@ inconvenience this causes.
 <h3>Specific improvements</h3>
 
 <ol>
+  <li> New: There is now a macro <code>DEAL_II_VERSION_GTE</code>
+  that can be used to test whether the deal.II version is greater
+  than or equal a particular version number. This is useful if you
+  need to make application programs compatible with different
+  deal.II releases.
+  <br>
+  (Wolfgang Bangerth, 2014/10/31)
+  </li>
+
   <li> Changed: PETSc and Trilinos vectors with ghost entries can now be reset to zero
   using = 0.0;
   <br>
diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 43e5e14f68..9a99d19aaf 100644
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -50,6 +50,13 @@
 #define DEAL_II_VERSION_MINOR @DEAL_II_VERSION_MINOR@
 #define DEAL_II_MINOR @DEAL_II_VERSION_MINOR@
 
+#define DEAL_II_VERSION_GTE(major,minor,subminor) \
+ ((DEAL_II_VERSION_MAJOR * 10000 + \
+    DEAL_II_VERSION_MINOR * 100 + \
+     DEAL_II_VERSION_SUBMINOR) \
+    >=  \
+    (major)*10000 + (minor)*100 + (subminor))
+
 
 /********************************************
  * Configured in check_1_compiler_features: *
-- 
2.39.5