bendns' repos / mindus
mindustry logic execution, map- and schematic- parsing and rendering
Diffstat (limited to 'src/utils/lazy.rs')
-rw-r--r--src/utils/lazy.rs45
1 files changed, 0 insertions, 45 deletions
diff --git a/src/utils/lazy.rs b/src/utils/lazy.rs
deleted file mode 100644
index 4d30aa2..0000000
--- a/src/utils/lazy.rs
+++ /dev/null
@@ -1,45 +0,0 @@
-//! [`LazyLock`](std::sync::LazyLock) copy
-use std::cell::UnsafeCell;
-use std::mem::ManuallyDrop;
-use std::panic::{RefUnwindSafe, UnwindSafe};
-
-union Data<T, F> {
- value: ManuallyDrop<T>,
- f: ManuallyDrop<F>,
-}
-
-pub struct Lock<T, F = fn() -> T> {
- data: UnsafeCell<Data<T, F>>,
-}
-
-impl<T, F: FnOnce() -> T> Lock<T, F> {
- #[inline]
- pub const fn new(f: F) -> Lock<T, F> {
- Lock {
- data: UnsafeCell::new(Data {
- f: ManuallyDrop::new(f),
- }),
- }
- }
-
- #[inline]
- /// SAFETY: CALL ONLY ONCE! NOT CHECKED
- pub unsafe fn load(this: &Lock<T, F>) {
- let data = &mut *this.data.get();
- let f = ManuallyDrop::take(&mut data.f);
- let value = f();
- data.value = ManuallyDrop::new(value);
- }
-}
-
-impl<T, F> Lock<T, F> {
- #[inline]
- /// SAFETY: CALL [load] FIRST!
- pub unsafe fn get(&self) -> &T {
- &(*self.data.get()).value
- }
-}
-
-unsafe impl<T: Sync + Send, F: Send> Sync for Lock<T, F> {}
-impl<T: RefUnwindSafe + UnwindSafe, F: UnwindSafe> RefUnwindSafe for Lock<T, F> {}
-impl<T: UnwindSafe, F: UnwindSafe> UnwindSafe for Lock<T, F> {}