Extend base::Callback to have a move-only variant

base/callback_forward.h

 // Copyright (c) 2011 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_CALLBACK_FORWARD_H_
 #define BASE_CALLBACK_FORWARD_H_
 
 namespace base {
 
-template <typename Sig>
+namespace internal {
+
+enum class CopyMode {
+  MoveOnly, Copyable,

[Nico, 2016/02/15 21:47:57]

Please give these two a comment explaining what they mean each.

[tzik, 2016/02/16 09:33:32]

Added a brief comment.

+};
+
+}  // namespace internal
+
+template <typename Signature,
+          internal::CopyMode copy_mode = internal::CopyMode::Copyable>
 class Callback;
 
 // Syntactic sugar to make Callback<void()> easier to declare since it
 // will be used in a lot of APIs with delayed execution.
 using Closure = Callback<void()>;
 
 }  // namespace base
 
 #endif  // BASE_CALLBACK_FORWARD_H_