From b3e3b006bd5c82516d6fdb487d5c1263a5249474 Mon Sep 17 00:00:00 2001
From: Anna Zaks <ganna@apple.com>
Date: Fri, 23 Sep 2011 19:10:26 +0000
Subject: [PATCH] Add getTreeFactory() to ImmutableSet to allow construction of
 ImmutableSetRef from an ImmutableSet object.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140402 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/ADT/ImmutableMap.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/llvm/ADT/ImmutableMap.h b/include/llvm/ADT/ImmutableMap.h
index 7386a3b9a1e..8346ffabff7 100644
--- a/include/llvm/ADT/ImmutableMap.h
+++ b/include/llvm/ADT/ImmutableMap.h
@@ -117,6 +117,10 @@ public:
       return ImmutableMap(Canonicalize ? F.getCanonicalTree(T): T);
     }
 
+    typename TreeTy::Factory *getTreeFactory() const {
+      return const_cast<typename TreeTy::Factory *>(&F);
+    }
+
   private:
     Factory(const Factory& RHS); // DO NOT IMPLEMENT
     void operator=(const Factory& RHS); // DO NOT IMPLEMENT