add a method

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22985 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/EquivalenceClasses.h b/include/llvm/ADT/EquivalenceClasses.h
index 2924df549ecf05814d3f5c8adf2ed92803dcff2a..da8688839515d5842152b2add8a1678ad3c5dbcc 100644 (file)
--- a/include/llvm/ADT/EquivalenceClasses.h
+++ b/include/llvm/ADT/EquivalenceClasses.h
@@ -138,6 +138,8 @@ public:
   iterator begin() const { return TheMapping.begin(); }
   iterator end() const { return TheMapping.end(); }
 
+  bool empty() const { return TheMapping.empty(); }
+
   /// member_* Iterate over the members of an equivalence class.
   ///
   class member_iterator;