61 lines
1.4 KiB
Rust
61 lines
1.4 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 https://mozilla.org/MPL/2.0/. */
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//! Helpers for different FFI pointer kinds that Gecko's FFI layer uses.
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use crate::gecko_bindings::structs::root::mozilla::detail::CopyablePtr;
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use servo_arc::Arc;
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use std::marker::PhantomData;
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use std::ops::{Deref, DerefMut};
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use std::ptr;
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/// Gecko-FFI-safe Arc (T is an ArcInner).
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///
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/// This can be null.
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///
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/// Leaks on drop. Please don't drop this.
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#[repr(C)]
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pub struct Strong<GeckoType> {
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ptr: *const GeckoType,
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_marker: PhantomData<GeckoType>,
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}
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impl<T> From<Arc<T>> for Strong<T> {
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fn from(arc: Arc<T>) -> Self {
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Self {
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ptr: Arc::into_raw(arc),
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_marker: PhantomData,
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}
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}
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}
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impl<GeckoType> Strong<GeckoType> {
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#[inline]
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/// Returns whether this reference is null.
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pub fn is_null(&self) -> bool {
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self.ptr.is_null()
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}
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#[inline]
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/// Returns a null pointer
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pub fn null() -> Self {
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Self {
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ptr: ptr::null(),
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_marker: PhantomData,
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}
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}
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}
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impl<T> Deref for CopyablePtr<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.mPtr
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}
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}
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impl<T> DerefMut for CopyablePtr<T> {
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fn deref_mut<'a>(&'a mut self) -> &'a mut T {
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&mut self.mPtr
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}
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}
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