Merge pull request #69 from earthstar-project/wb_cleanup

wb_async_utils cleanup

wb_async_utils/src/lib.rs

@@ -15,3 +15,17 @@ pub mod spsc;
 
 #[cfg(feature = "ufotofu_utils")]
 pub mod shared_producer;
+
+// This is safe if and only if the object pointed at by `reference` lives for at least `'longer`.
+// See https://doc.rust-lang.org/nightly/std/intrinsics/fn.transmute.html for more detail.
+pub(crate) unsafe fn extend_lifetime<'shorter, 'longer, T: ?Sized>(reference: &'shorter T) -> &'longer T {
+    core::mem::transmute::<&'shorter T, &'longer T>(reference)
+}
+
+// This is safe if and only if the object pointed at by `reference` lives for at least `'longer`.
+// See https://doc.rust-lang.org/nightly/std/intrinsics/fn.transmute.html for more detail.
+pub(crate) unsafe fn extend_lifetime_mut<'shorter, 'longer, T: ?Sized>(
+    reference: &'shorter mut T,
+) -> &'longer mut T {
+    core::mem::transmute::<&'shorter mut T, &'longer mut T>(reference)
+}