device/usb/scoped_libusb_device_handle.h

// Copyright 2018 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_USB_SCOPED_LIBUSB_DEVICE_HANDLE_H_
#define DEVICE_USB_SCOPED_LIBUSB_DEVICE_HANDLE_H_

#include "base/macros.h"
#include "base/memory/scoped_refptr.h"

struct libusb_device_handle;

namespace device {

class UsbContext;

// This class owns a reference to a libusb_device_handle as well as a reference
// to the libusb_context. The libusb_context must outlive any
// libusb_device_handle instances created from it.
class ScopedLibusbDeviceHandle {
 public:
  ScopedLibusbDeviceHandle(libusb_device_handle* handle,
                           scoped_refptr<UsbContext> context);
  ScopedLibusbDeviceHandle(ScopedLibusbDeviceHandle&& other);
  ~ScopedLibusbDeviceHandle();

  libusb_device_handle* get() const { return handle_; }

  void Reset();
  bool IsValid() const;

 private:
  libusb_device_handle* handle_;
  scoped_refptr<UsbContext> context_;

  DISALLOW_COPY_AND_ASSIGN(ScopedLibusbDeviceHandle);
};

}  // namespace device

#endif  // DEVICE_USB_SCOPED_LIBUSB_DEVICE_HANDLE_H_