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