From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- layout/style/RustCell.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 layout/style/RustCell.h (limited to 'layout/style/RustCell.h') diff --git a/layout/style/RustCell.h b/layout/style/RustCell.h new file mode 100644 index 0000000000..24f2ebc74d --- /dev/null +++ b/layout/style/RustCell.h @@ -0,0 +1,45 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* an object with the same layout as a Rust std::cell::Cell */ + +#ifndef mozilla_RustCell_h +#define mozilla_RustCell_h + +namespace mozilla { + +/** + * Object with the same layout as std::cell::Cell. + * + * ServoBindings.toml defines a mapping so that generated bindings use a + * real std::cell::Cell. + * + * Note that while the layout matches, this doesn't have the same ABI as a + * std::cell::Cell, so values of this type can't be passed over FFI + * functions. + */ +template +class RustCell { + public: + RustCell() : mValue() {} + explicit RustCell(T aValue) : mValue(aValue) {} + + T Get() const { return mValue; } + void Set(T aValue) { mValue = aValue; } + + // That this API doesn't mirror the API of rust's Cell because all values in + // C++ effectively act like they're wrapped in Cell<...> already, so this type + // only exists for FFI purposes. + T* AsPtr() { return &mValue; } + const T* AsPtr() const { return &mValue; } + + private: + T mValue; +}; + +} // namespace mozilla + +#endif // mozilla_RustCell_h -- cgit v1.2.3