X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2FEnumerate.h;h=9efecfd2b83b5e422663bc2b81ba6ee7b10b8fdb;hb=b3e7df8220f410398011fea71b280ba8be459fcc;hp=f4fb12bebaec79a23e9b5b21037ce5422c7ff800;hpb=5f92025ef5c641f44347a207d800023094ee56b5;p=folly.git

diff --git a/folly/Enumerate.h b/folly/Enumerate.h
index f4fb12be..9efecfd2 100644
--- a/folly/Enumerate.h
+++ b/folly/Enumerate.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -60,6 +60,18 @@ struct MakeConst<T*> {
   using type = const T*;
 };
 
+// Raw pointers don't have an operator->() member function, so the
+// second overload will be SFINAEd out in that case. Otherwise, the
+// second is preferred in the partial order for getPointer(_, 0).
+template <class Iterator>
+auto getPointer(const Iterator& it, long) -> decltype(std::addressof(*it)) {
+  return std::addressof(*it);
+}
+template <class Iterator>
+auto getPointer(const Iterator& it, int) -> decltype(it.operator->()) {
+  return it.operator->();
+}
+
 template <class Iterator>
 class Enumerator {
  public:
@@ -80,7 +92,7 @@ class Enumerator {
       return *it_;
     }
     pointer operator->() {
-      return std::addressof(**this);
+      return getPointer(it_, 0);
     }
 
     // Const Proxy: Force const references.
@@ -88,7 +100,7 @@ class Enumerator {
       return *it_;
     }
     typename MakeConst<pointer>::type operator->() const {
-      return std::addressof(**this);
+      return getPointer(it_, 0);
     }
 
    private: