From: Daniel Berlin <dberlin@dberlin.org>
Date: Tue, 7 Mar 2017 18:47:50 +0000 (+0000)
Subject: Add PointerLikeTypeTraits for const things, as long as there is one for the non-const... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=434e38630cd0f2477166907514ad420fe5489588;p=llvm

Add PointerLikeTypeTraits for const things, as long as there is one for the non-const version. Clang and other users have a number of types they use as pointers, and this avoids having to define both const and non-const versions of PointerLikeTraits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297181 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Support/PointerLikeTypeTraits.h b/include/llvm/Support/PointerLikeTypeTraits.h
index 9ff894edbeb..521a49684e4 100644
--- a/include/llvm/Support/PointerLikeTypeTraits.h
+++ b/include/llvm/Support/PointerLikeTypeTraits.h
@@ -60,6 +60,20 @@ public:
   enum { NumLowBitsAvailable = 2 };
 };
 
+// Provide PointerLikeTypeTraits for const things.
+template <typename T> class PointerLikeTypeTraits<const T> {
+  typedef PointerLikeTypeTraits<T> NonConst;
+
+public:
+  static inline const void *getAsVoidPointer(const T P) {
+    return NonConst::getAsVoidPointer(P);
+  }
+  static inline const T getFromVoidPointer(const void *P) {
+    return NonConst::getFromVoidPointer(const_cast<void *>(P));
+  }
+  enum { NumLowBitsAvailable = NonConst::NumLowBitsAvailable };
+};
+
 // Provide PointerLikeTypeTraits for const pointers.
 template <typename T> class PointerLikeTypeTraits<const T *> {
   typedef PointerLikeTypeTraits<T *> NonConst;