Move ScopedIOObject to base/mac.

That way, it can be used in rlz.

BUG=none
TEST=none
TBR=mark (who said "LG" instead of "LGTM")

Review URL: https://chromiumcodereview.appspot.com/9839058

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@128533 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 76 insertions, 0 deletions

diff --git a/base/base.gypi b/base/base.gypi
index e2423e5..bca1c09 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -168,6 +168,7 @@
           'mac/scoped_aedesc.h',
           'mac/scoped_authorizationref.h',
           'mac/scoped_cftyperef.h',
+          'mac/scoped_ioobject.h',
           'mac/scoped_nsautorelease_pool.h',
           'mac/scoped_nsautorelease_pool.mm',
           'mac/scoped_nsexception_enabler.h',
diff --git a/base/mac/scoped_ioobject.h b/base/mac/scoped_ioobject.h
new file mode 100644
index 0000000..d5cb90c
--- /dev/null
+++ b/base/mac/scoped_ioobject.h
@@ -0,0 +1,75 @@
+// 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_MAC_SCOPED_IOOBJECT_H_
+#define BASE_MAC_SCOPED_IOOBJECT_H_
+#pragma once
+
+#include <IOKit/IOKitLib.h>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+
+namespace base {
+namespace mac {
+
+// Just like ScopedCFTypeRef but for io_object_t and subclasses.
+template<typename IOT>
+class ScopedIOObject {
+ public:
+  typedef IOT element_type;
+
+  explicit ScopedIOObject(IOT object = NULL)
+      : object_(object) {
+  }
+
+  ~ScopedIOObject() {
+    if (object_)
+      IOObjectRelease(object_);
+  }
+
+  void reset(IOT object = NULL) {
+    if (object_)
+      IOObjectRelease(object_);
+    object_ = object;
+  }
+
+  bool operator==(IOT that) const {
+    return object_ == that;
+  }
+
+  bool operator!=(IOT that) const {
+    return object_ != that;
+  }
+
+  operator IOT() const {
+    return object_;
+  }
+
+  IOT get() const {
+    return object_;
+  }
+
+  void swap(ScopedIOObject& that) {
+    IOT temp = that.object_;
+    that.object_ = object_;
+    object_ = temp;
+  }
+
+  IOT release() WARN_UNUSED_RESULT {
+    IOT temp = object_;
+    object_ = NULL;
+    return temp;
+  }
+
+ private:
+  IOT object_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedIOObject);
+};
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_SCOPED_IOOBJECT_H_