blob: 25dac33a33bf901c224cc88b39018eca296cd886 [file] [log] [blame]
* Copyright (c) 2017 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.
// Annotate a function indicating the caller must examine the return value.
// Use like:
// To explicitly ignore a result, cast to void.
// TODO(kwiberg): Remove when we can use [[nodiscard]] from C++17.
#if defined(__clang__)
#define RTC_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
#elif defined(__GNUC__)
// gcc has a __warn_unused_result__ attribute, but you can't quiet it by
// casting to void, so we don't use it.
// Macro to be used for switch-case fallthrough (required for enabling
// -Wimplicit-fallthrough warning on Clang).
#if defined(__clang__)
#define RTC_FALLTHROUGH() [[clang::fallthrough]]
#define RTC_FALLTHROUGH() do { } while (0)
// Prevent the compiler from warning about an unused variable. For example:
// int result = DoSomething();
// assert(result == 17);
// RTC_UNUSED(result);
// Note: In most cases it is better to remove the unused variable rather than
// suppressing the compiler warning.
#define RTC_UNUSED(x) static_cast<void>(x)