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39 lines
970 B
C++
39 lines
970 B
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_unused_h
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#define mozilla_unused_h
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#include "mozilla/Types.h"
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#ifdef __cplusplus
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namespace mozilla {
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//
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// Suppress GCC warnings about unused return values with
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// Unused << SomeFuncDeclaredWarnUnusedReturnValue();
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//
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struct unused_t
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{
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template<typename T>
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inline void
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operator<<(const T& /*unused*/) const {}
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};
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extern MFBT_DATA const unused_t Unused;
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} // namespace mozilla
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#endif // __cplusplus
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// An alternative to mozilla::Unused for use in (a) C code and (b) code where
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// linking with unused.o is difficult.
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#define MOZ_UNUSED(expr) \
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do { if (expr) { (void)0; } } while (0)
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#endif // mozilla_unused_h
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