|  | // Copyright 2016 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_MAC_SCOPED_DISPATCH_OBJECT_H_ | 
|  | #define BASE_MAC_SCOPED_DISPATCH_OBJECT_H_ | 
|  |  | 
|  | #include <dispatch/dispatch.h> | 
|  |  | 
|  | #include "base/mac/scoped_typeref.h" | 
|  |  | 
|  | namespace base { | 
|  |  | 
|  | namespace internal { | 
|  |  | 
|  | template <typename T> | 
|  | struct ScopedDispatchObjectTraits { | 
|  | static constexpr T InvalidValue() { return nullptr; } | 
|  | static T Retain(T object) { | 
|  | dispatch_retain(object); | 
|  | return object; | 
|  | } | 
|  | static void Release(T object) { | 
|  | dispatch_release(object); | 
|  | } | 
|  | }; | 
|  |  | 
|  | }  // namepsace internal | 
|  |  | 
|  | template <typename T> | 
|  | using ScopedDispatchObject = | 
|  | ScopedTypeRef<T, internal::ScopedDispatchObjectTraits<T>>; | 
|  |  | 
|  | }  // namespace base | 
|  |  | 
|  | #endif  // BASE_MAC_SCOPED_DISPATCH_OBJECT_H_ |