Make QualTypeOrdering::operator() const

llvm-svn: 58097

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/include/clang/AST/TypeOrdering.h b/clang/include/clang/AST/TypeOrdering.h
index 38e7f76ac43..a21655b5805 100644
--- a/clang/include/clang/AST/TypeOrdering.h
+++ b/clang/include/clang/AST/TypeOrdering.h
@@ -24,7 +24,7 @@ namespace clang {
 /// QualTypeOrdering - Function object that provides a total ordering
 /// on QualType values.
 struct QualTypeOrdering : std::binary_function<QualType, QualType, bool> {
-  bool operator()(QualType T1, QualType T2) {
+  bool operator()(QualType T1, QualType T2) const {
     return std::less<void*>()(T1.getAsOpaquePtr(), T2.getAsOpaquePtr());
   }
 };