1 files changed, 9 insertions, 0 deletions
diff --git a/include/clang/Basic/SourceLocation.h b/include/clang/Basic/SourceLocation.h
index 605c4bbafc..14bb2b724f 100644
--- a/include/clang/Basic/SourceLocation.h
+++ b/include/clang/Basic/SourceLocation.h
@@ -16,6 +16,7 @@
 
 #include "llvm/Support/PointerLikeTypeTraits.h"
 #include <utility>
+#include <functional>
 #include <cassert>
 
 namespace llvm {
@@ -295,6 +296,14 @@ public:
     return isBeforeInTranslationUnitThan((SourceLocation)Loc);
   }
 
+  /// \brief Comparison function class, useful for sorting FullSourceLocs.
+  struct BeforeThanCompare : public std::binary_function<FullSourceLoc,
+                                                         FullSourceLoc, bool> {
+    bool operator()(const FullSourceLoc& lhs, const FullSourceLoc& rhs) const {
+      return lhs.isBeforeInTranslationUnitThan(rhs);
+    }
+  };
+
   /// Prints information about this FullSourceLoc to stderr. Useful for
   ///  debugging.
   void dump() const { SourceLocation::dump(*SrcMgr); }