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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
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/Attributes.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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template <typename T>
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MOZ_ALWAYS_INLINE_EVEN_DEBUG void 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 { \
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if (expr) { \
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(void)0; \
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} \
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} while (0)
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#endif // mozilla_unused_h
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