forked from mirrors/gecko-dev
2712714d84
Differential Revision: https://phabricator.services.mozilla.com/D68554 --HG-- extra : moz-landing-system : lando
75 lines
2 KiB
C++
75 lines
2 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_StaticPrefsBase_h
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#define mozilla_StaticPrefsBase_h
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#include <type_traits>
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#include "mozilla/Atomics.h"
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namespace mozilla {
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class SharedPrefMapBuilder;
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// These typedefs are for use within init/StaticPrefList*.h.
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typedef const char* String;
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typedef Atomic<bool, Relaxed> RelaxedAtomicBool;
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typedef Atomic<bool, ReleaseAcquire> ReleaseAcquireAtomicBool;
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typedef Atomic<bool, SequentiallyConsistent> SequentiallyConsistentAtomicBool;
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typedef Atomic<int32_t, Relaxed> RelaxedAtomicInt32;
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typedef Atomic<int32_t, ReleaseAcquire> ReleaseAcquireAtomicInt32;
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typedef Atomic<int32_t, SequentiallyConsistent>
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SequentiallyConsistentAtomicInt32;
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typedef Atomic<uint32_t, Relaxed> RelaxedAtomicUint32;
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typedef Atomic<uint32_t, ReleaseAcquire> ReleaseAcquireAtomicUint32;
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typedef Atomic<uint32_t, SequentiallyConsistent>
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SequentiallyConsistentAtomicUint32;
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// XXX: Atomic<float> currently doesn't work (see bug 1552086). Once it's
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// supported we will be able to use Atomic<float> here.
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typedef std::atomic<float> AtomicFloat;
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template <typename T>
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struct StripAtomicImpl {
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typedef T Type;
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};
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template <typename T, MemoryOrdering Order>
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struct StripAtomicImpl<Atomic<T, Order>> {
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typedef T Type;
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};
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template <typename T>
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struct StripAtomicImpl<std::atomic<T>> {
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typedef T Type;
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};
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template <typename T>
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using StripAtomic = typename StripAtomicImpl<T>::Type;
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template <typename T>
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struct IsAtomic : std::false_type {};
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template <typename T, MemoryOrdering Order>
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struct IsAtomic<Atomic<T, Order>> : std::true_type {};
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template <typename T>
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struct IsAtomic<std::atomic<T>> : std::true_type {};
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namespace StaticPrefs {
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void MaybeInitOncePrefs();
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} // namespace StaticPrefs
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} // namespace mozilla
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#endif // mozilla_StaticPrefsBase_h
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