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Checkpoint: Cast through std::mem::transmute

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This commit is contained in:
Marshall Bowers 2023-09-29 19:41:31 -04:00
parent 103183f494
commit 963f179d7f
6 changed files with 59 additions and 72 deletions
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25
crates/gpui3/src/app.rs
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@ -112,6 +112,23 @@ impl DerefMut for AppContext<MainThread> {
}
impl<Thread> AppContext<Thread> {
// TODO: Better names for these?
#[inline]
pub fn downcast(&self) -> &AppContext<()> {
// Any `Thread` can become `()`.
//
// Can't do this in a blanket `Deref` impl, as it infinitely recurses.
unsafe { std::mem::transmute::<&AppContext<Thread>, &AppContext<()>>(self) }
}
#[inline]
pub fn downcast_mut(&mut self) -> &mut AppContext<()> {
// Any `Thread` can become `()`.
//
// Can't do this in a blanket `DerefMut` impl, as it infinitely recurses.
unsafe { std::mem::transmute::<&mut AppContext<Thread>, &mut AppContext<()>>(self) }
}
pub fn text_system(&self) -> &Arc<TextSystem> {
&self.text_system
}
@ -206,7 +223,7 @@ impl<Thread> AppContext<Thread> {
pub(crate) fn update_window<R>(
&mut self,
id: WindowId,
update: impl FnOnce(&mut WindowContext<Thread>) -> R,
update: impl FnOnce(&mut WindowContext) -> R,
) -> Result<R> {
self.update(|cx| {
let mut window = cx
@ -216,7 +233,7 @@ impl<Thread> AppContext<Thread> {
.take()
.unwrap();
let result = update(&mut WindowContext::mutable(cx, &mut window));
let result = update(&mut WindowContext::mutable(cx.downcast_mut(), &mut window));
window.dirty = true;
cx.windows
@ -276,8 +293,8 @@ impl<Thread> AppContext<Thread> {
}
}
impl<Thread: 'static> Context for AppContext<Thread> {
type EntityContext<'a, 'w, T: Send + Sync + 'static> = ModelContext<'a, T, Thread>;
impl Context for AppContext {
type EntityContext<'a, 'w, T: Send + Sync + 'static> = ModelContext<'a, T>;
type Result<T> = T;
fn entity<T: Send + Sync + 'static>(