blob: a602fd9cbb263ff9eea9edbdd3a2fce003789c30 [file] [log] [blame]
// 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.
#include <CoreFoundation/CoreFoundation.h>
#include "base/mac/scoped_typeref.h"
namespace base {
// ScopedCFTypeRef<> is patterned after std::unique_ptr<>, but maintains
// ownership of a CoreFoundation object: any object that can be represented
// as a CFTypeRef. Style deviations here are solely for compatibility with
// std::unique_ptr<>'s interface, with which everyone is already familiar.
// By default, ScopedCFTypeRef<> takes ownership of an object (in the
// constructor or in reset()) by taking over the caller's existing ownership
// claim. The caller must own the object it gives to ScopedCFTypeRef<>, and
// relinquishes an ownership claim to that object. ScopedCFTypeRef<> does not
// call CFRetain(). This behavior is parameterized by the |OwnershipPolicy|
// enum. If the value |RETAIN| is passed (in the constructor or in reset()),
// then ScopedCFTypeRef<> will call CFRetain() on the object, and the initial
// ownership is not changed.
namespace internal {
template <typename CFT>
struct ScopedCFTypeRefTraits {
static CFT InvalidValue() { return nullptr; }
static CFT Retain(CFT object) {
return object;
static void Release(CFT object) { CFRelease(object); }
} // namespace internal
template <typename CFT>
using ScopedCFTypeRef =
ScopedTypeRef<CFT, internal::ScopedCFTypeRefTraits<CFT>>;
} // namespace base