From 7876c7915b2c275e93a3fa5a83bd027c6d6a5183 Mon Sep 17 00:00:00 2001
From: Ralf Habacker <ralf.habacker@freenet.de>
Date: Mon, 20 Jun 2016 08:14:53 +0200
Subject: [PATCH] clang 6.0 compile fixes.

---
 include/osgDB/ObjectCache | 2 +-
 src/osgDB/ObjectCache.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/osgDB/ObjectCache b/include/osgDB/ObjectCache
index 01b3f0581..fc068707e 100644
--- a/include/osgDB/ObjectCache
+++ b/include/osgDB/ObjectCache
@@ -72,7 +72,7 @@ class OSGDB_EXPORT ObjectCache : public osg::Referenced
 
         class ClassComp {
         public:
-            bool operator() (const ObjectCache::FileNameOptionsPair& lhs, const ObjectCache::FileNameOptionsPair& rhs);
+            bool operator() (const ObjectCache::FileNameOptionsPair& lhs, const ObjectCache::FileNameOptionsPair& rhs) const;
         };
 
         typedef std::pair<osg::ref_ptr<osg::Object>, double >           ObjectTimeStampPair;
diff --git a/src/osgDB/ObjectCache.cpp b/src/osgDB/ObjectCache.cpp
index 48acc1b88..00b3aca2b 100644
--- a/src/osgDB/ObjectCache.cpp
+++ b/src/osgDB/ObjectCache.cpp
@@ -16,7 +16,7 @@
 
 using namespace osgDB;
 
-bool ObjectCache::ClassComp::operator() (const ObjectCache::FileNameOptionsPair& lhs, const ObjectCache::FileNameOptionsPair& rhs)
+bool ObjectCache::ClassComp::operator() (const ObjectCache::FileNameOptionsPair& lhs, const ObjectCache::FileNameOptionsPair& rhs) const
 {
     return lhs.first < rhs.first || *lhs.second < *rhs.second;
 }