From 95f7e2d2fd4428bfecf269f216ee20a4b749a18e Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Fri, 29 Aug 2014 06:01:43 +0000
Subject: [PATCH] Add conversion constructor to convert ArrayRef<T*> to
 ArrayRef<const T*>. Reviewed with Chandler and David Blaikie.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216709 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/ADT/ArrayRef.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/llvm/ADT/ArrayRef.h b/include/llvm/ADT/ArrayRef.h
index 0351cf5bb4c..8c14a423c8f 100644
--- a/include/llvm/ADT/ArrayRef.h
+++ b/include/llvm/ADT/ArrayRef.h
@@ -104,6 +104,14 @@ namespace llvm {
       Length(Vec.size()) {}
 #endif
 
+    /// Construct an ArrayRef<const T*> from ArrayRef<T*>. This uses SFINAE to
+    /// ensure that only ArrayRefs of pointers can be converted.
+    template <typename U>
+    ArrayRef(const ArrayRef<U *> &A,
+             typename std::enable_if<
+                 std::is_convertible<U *const *, T const *>::value>::type* = 0)
+      : Data(A.data()), Length(A.size()) {}
+
     /// @}
     /// @name Simple Operations
     /// @{
-- 
2.34.1