|  | /* | 
|  | *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved. | 
|  | * | 
|  | *  Use of this source code is governed by a BSD-style license | 
|  | *  that can be found in the LICENSE file in the root of the source | 
|  | *  tree. An additional intellectual property rights grant can be found | 
|  | *  in the file PATENTS.  All contributing project authors may | 
|  | *  be found in the AUTHORS file in the root of the source tree. | 
|  | */ | 
|  |  | 
|  | #ifndef RTC_BASE_SYSTEM_UNUSED_H_ | 
|  | #define RTC_BASE_SYSTEM_UNUSED_H_ | 
|  |  | 
|  | // Prevent the compiler from warning about an unused variable. For example: | 
|  | //   int result = DoSomething(); | 
|  | //   RTC_DCHECK(result == 17); | 
|  | //   RTC_UNUSED(result); | 
|  | // Note: In most cases it is better to remove the unused variable rather than | 
|  | // suppressing the compiler warning. | 
|  | #ifndef RTC_UNUSED | 
|  | #ifdef __cplusplus | 
|  | #define RTC_UNUSED(x) static_cast<void>(x) | 
|  | #else | 
|  | #define RTC_UNUSED(x) (void)(x) | 
|  | #endif | 
|  | #endif  // RTC_UNUSED | 
|  |  | 
|  | #endif  // RTC_BASE_SYSTEM_UNUSED_H_ |