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597c2fe947
The flags stylo cares about reading and writing potentially at the same time are disjoint, so there's no need for any strong memory ordering. Differential Revision: https://phabricator.services.mozilla.com/D141829
45 lines
1.3 KiB
C++
45 lines
1.3 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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/* an object with the same layout as a Rust std::cell::Cell<T> */
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#ifndef mozilla_RustCell_h
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#define mozilla_RustCell_h
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namespace mozilla {
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/**
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* Object with the same layout as std::cell::Cell<T>.
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*
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* ServoBindings.toml defines a mapping so that generated bindings use a
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* real std::cell::Cell<T>.
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*
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* Note that while the layout matches, this doesn't have the same ABI as a
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* std::cell::Cell<T>, so values of this type can't be passed over FFI
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* functions.
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*/
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template <typename T>
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class RustCell {
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public:
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RustCell() : mValue() {}
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explicit RustCell(T aValue) : mValue(aValue) {}
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T Get() const { return mValue; }
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void Set(T aValue) { mValue = aValue; }
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// That this API doesn't mirror the API of rust's Cell because all values in
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// C++ effectively act like they're wrapped in Cell<...> already, so this type
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// only exists for FFI purposes.
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T* AsPtr() { return &mValue; }
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const T* AsPtr() const { return &mValue; }
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private:
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T mValue;
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};
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} // namespace mozilla
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#endif // mozilla_RustCell_h
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