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| 1 /* |
| 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_RTC_BASE_ANNOTATIONS_H_ |
| 12 #define WEBRTC_RTC_BASE_ANNOTATIONS_H_ |
| 13 |
| 14 // Annotate a function indicating the caller must examine the return value. |
| 15 // Use like: |
| 16 // int foo() RTC_WARN_UNUSED_RESULT; |
| 17 // To explicitly ignore a result, cast to void. |
| 18 // TODO(kwiberg): Remove when we can use [[nodiscard]] from C++17. |
| 19 #if defined(__clang__) |
| 20 #define RTC_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__)) |
| 21 #elif defined(__GNUC__) |
| 22 // gcc has a __warn_unused_result__ attribute, but you can't quiet it by |
| 23 // casting to void, so we don't use it. |
| 24 #define RTC_WARN_UNUSED_RESULT |
| 25 #else |
| 26 #define RTC_WARN_UNUSED_RESULT |
| 27 #endif |
| 28 |
| 29 // Macro to be used for switch-case fallthrough (required for enabling |
| 30 // -Wimplicit-fallthrough warning on Clang). |
| 31 #if defined(__clang__) |
| 32 #define RTC_FALLTHROUGH() [[clang::fallthrough]] |
| 33 #else |
| 34 #define RTC_FALLTHROUGH() do { } while (0) |
| 35 #endif |
| 36 |
| 37 // TODO(solenberg): For backwards compatibility - remove once Chromium updated. |
| 38 #define FALLTHROUGH RTC_FALLTHROUGH |
| 39 |
| 40 // Prevent the compiler from warning about an unused variable. For example: |
| 41 // int result = DoSomething(); |
| 42 // assert(result == 17); |
| 43 // RTC_UNUSED(result); |
| 44 // Note: In most cases it is better to remove the unused variable rather than |
| 45 // suppressing the compiler warning. |
| 46 #define RTC_UNUSED(x) static_cast<void>(x) |
| 47 |
| 48 #endif // WEBRTC_RTC_BASE_ANNOTATIONS_H_ |
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