171511657e
#3050 Source-Repo: https://github.com/servo/servo Source-Revision: 7c1054e6ab97dd199dee371c3b6ca5d559070804
69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
/* 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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use dom::bindings::trace::JSTraceable;
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use js::jsapi::{JSTracer};
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use std::cell;
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use std::cell::RefCell;
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use std::mem;
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/// A mutable field in DOM for large sized value.
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/// This has a special method to return the pointer of itself
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/// for used in layout task.
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/// This simply wraps `RefCell<T>` to add the special method.
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pub struct DOMRefCell<T> {
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base: RefCell<T>,
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}
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pub type Ref<'a, T> = cell::Ref<'a, T>;
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pub type RefMut<'a, T> = cell::RefMut<'a, T>;
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impl<T> DOMRefCell<T> {
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#[inline(always)]
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pub fn new(value: T) -> DOMRefCell<T> {
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DOMRefCell {
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base: RefCell::new(value),
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}
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}
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#[inline(always)]
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pub fn unwrap(self) -> T {
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self.base.unwrap()
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}
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#[inline(always)]
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pub fn try_borrow<'a>(&'a self) -> Option<Ref<'a, T>> {
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self.base.try_borrow()
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}
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#[inline(always)]
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pub fn borrow<'a>(&'a self) -> Ref<'a, T> {
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self.base.borrow()
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}
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#[inline(always)]
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pub fn try_borrow_mut<'a>(&'a self) -> Option<RefMut<'a, T>> {
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self.base.try_borrow_mut()
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}
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#[inline(always)]
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pub fn borrow_mut<'a>(&'a self) -> RefMut<'a, T> {
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self.base.borrow_mut()
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}
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/// This returns the pointer which refers T in `RefCell<T>` directly.
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pub unsafe fn borrow_for_layout<'a>(&'a self) -> &'a T {
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let val = mem::transmute::<&RefCell<T>, &T>(&self.base);
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val
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}
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}
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impl<T: JSTraceable> JSTraceable for DOMRefCell<T> {
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fn trace(&self, trc: *mut JSTracer) {
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(*self).base.borrow().trace(trc)
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}
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}
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