Add nullptr support to scoped_ptr.

base/move.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MOVE_H_
 #define BASE_MOVE_H_
 
 // Macro with the boilerplate that makes a type move-only in C++03.
 //
 // USAGE
@@ skipping 197 matching lines @@
     type* object; \
   }; \
   type(type&); \
   void operator=(type&); \
  public: \
   operator rvalue_type() { return rvalue_type(this); } \
   type Pass() { return type(rvalue_type(this)); } \
   typedef void MoveOnlyTypeForCPP03; \
  private:
 
+#define MOVE_ONLY_TYPE_FOR_CPP_03_WITH_MOVE_CONSTRUCTOR(type) \
+ private: \
+  type(type&); \
+  void operator=(type&); \
+ public: \
+  typedef void MoveOnlyTypeForCPP03; \
+  type&& Pass() { return static_cast<type&&>(*this); } \

[jamesr, 2014/09/26 20:22:45]

no, this is not something we should add as a general purpose macro yet.

[danakj, 2014/09/26 20:57:52]

Why? It's only useful if they also add a T&& constructor to the class, which is
banned. I could do all of this inline in the 2 scoped_ptr classes, but given the
aforementioned, is that really needed?

+ private:
+
 #endif  // BASE_MOVE_H_