Restore save compatibility with 0.11 final.

This does not include trunk versions older than some time after 0.11
branching, although you can upgrade such saves in two steps, by loading in
0.11 and then in current trunk.  I doubt this will lead to any troubles
as 0.10 saves are not compatible anyway.

1 files changed, 18 insertions, 0 deletions

diff --git a/crawl-ref/source/externs.h b/crawl-ref/source/externs.h
index bedb0afa14..5706fe3d97 100644
--- a/crawl-ref/source/externs.h
+++ b/crawl-ref/source/externs.h
@@ -281,6 +281,24 @@ static inline monster_type operator++(monster_type &x)
     return x;
 }
 
+static inline monster_type operator--(monster_type &x)
+{
+    x = static_cast<monster_type>(x - 1);
+    return x;
+}
+
+static inline spell_type operator++(spell_type &x)
+{
+    x = static_cast<spell_type>(x + 1);
+    return x;
+}
+
+static inline spell_type operator--(spell_type &x)
+{
+    x = static_cast<spell_type>(x - 1);
+    return x;
+}
+
 struct cloud_struct
 {
     coord_def     pos;