device/hid/udev_common.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef DEVICE_HID_UDEV_COMMON_H_
   6 #define DEVICE_HID_UDEV_COMMON_H_
   7
   8 #include <libudev.h>
   9
  10 #include "base/memory/scoped_ptr.h"
  11
  12 namespace device {
  13
  14 template <typename T, void func(T*)>
  15 void DiscardReturnType(T* arg) {
  16   func(arg);
  17 }
  18
  19 template <typename T, T* func(T*)>
  20 void DiscardReturnType(T* arg) {
  21   func(arg);
  22 }
  23
  24 template <typename T, void func(T*)>
  25 struct Deleter {
  26   void operator()(T* enumerate) const {
  27     if (enumerate != NULL)
  28       func(enumerate);
  29   }
  30 };
  31
  32 typedef Deleter<udev, DiscardReturnType<udev, udev_unref> > UdevDeleter;
  33 typedef Deleter<udev_enumerate,
  34                 DiscardReturnType<udev_enumerate, udev_enumerate_unref> >
  35     UdevEnumerateDeleter;
  36 typedef Deleter<udev_device, DiscardReturnType<udev_device, udev_device_unref> >
  37     UdevDeviceDeleter;
  38 typedef Deleter<udev_monitor,
  39                 DiscardReturnType<udev_monitor, udev_monitor_unref> >
  40     UdevMonitorDeleter;
  41
  42 typedef scoped_ptr<udev, UdevDeleter> ScopedUdevPtr;
  43 typedef scoped_ptr<udev_enumerate, UdevEnumerateDeleter> ScopedUdevEnumeratePtr;
  44 typedef scoped_ptr<udev_device, UdevDeviceDeleter> ScopedUdevDevicePtr;
  45 typedef scoped_ptr<udev_monitor, UdevMonitorDeleter> ScopedUdevMonitorPtr;
  46
  47 }  // namespace device
  48
  49 #endif  // DEVICE_HID_UDEV_COMMON_H_