Linux: Unify udev scopers.

device/hid/udev_common.h

-// Copyright 2014 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 DEVICE_HID_UDEV_COMMON_H_
-#define DEVICE_HID_UDEV_COMMON_H_
-
-#include <libudev.h>
-
-#include "base/memory/scoped_ptr.h"
-
-namespace device {
-
-template <typename T, void func(T*)>
-void DiscardReturnType(T* arg) {
-  func(arg);
-}
-
-template <typename T, T* func(T*)>
-void DiscardReturnType(T* arg) {
-  func(arg);
-}
-
-template <typename T, void func(T*)>
-struct Deleter {
-  void operator()(T* enumerate) const {
-    if (enumerate != NULL)
-      func(enumerate);
-  }
-};
-
-typedef Deleter<udev, DiscardReturnType<udev, udev_unref> > UdevDeleter;
-typedef Deleter<udev_enumerate,
-                DiscardReturnType<udev_enumerate, udev_enumerate_unref> >
-    UdevEnumerateDeleter;
-typedef Deleter<udev_device, DiscardReturnType<udev_device, udev_device_unref> >
-    UdevDeviceDeleter;
-typedef Deleter<udev_monitor,
-                DiscardReturnType<udev_monitor, udev_monitor_unref> >
-    UdevMonitorDeleter;
-
-typedef scoped_ptr<udev, UdevDeleter> ScopedUdevPtr;
-typedef scoped_ptr<udev_enumerate, UdevEnumerateDeleter> ScopedUdevEnumeratePtr;
-typedef scoped_ptr<udev_device, UdevDeviceDeleter> ScopedUdevDevicePtr;
-typedef scoped_ptr<udev_monitor, UdevMonitorDeleter> ScopedUdevMonitorPtr;
-
-}  // namespace device
-
-#endif  // DEVICE_HID_UDEV_COMMON_H_