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use std::ops::{Deref, DerefMut}; pub struct AsyncDestruction<T: 'static + Send> { ptr: *mut T, } impl<T: 'static + Send> AsyncDestruction<T> { #[inline(always)] pub fn new(x: T) -> Self { Self { ptr: Box::leak(Box::new(x)), } } } impl<T: 'static + Send> AsMut<T> for AsyncDestruction<T> { #[inline(always)] fn as_mut(&mut self) -> &mut T { unsafe { &mut *self.ptr } } } impl<T: 'static + Send> AsRef<T> for AsyncDestruction<T> { #[inline(always)] fn as_ref(&self) -> &T { unsafe { &*self.ptr } } } impl<T: 'static + Send> Deref for AsyncDestruction<T> { type Target = T; #[inline(always)] fn deref(&self) -> &Self::Target { unsafe { &*self.ptr } } } impl<T: 'static + Send> DerefMut for AsyncDestruction<T> { #[inline(always)] fn deref_mut(&mut self) -> &mut Self::Target { unsafe { &mut *self.ptr } } } impl<T: 'static + Send> Drop for AsyncDestruction<T> { fn drop(&mut self) { let inner = unsafe { Box::from_raw(self.ptr) }; tokio::spawn(async move { drop(inner) }); } } #[cfg(test)] mod tests { use super::AsyncDestruction; use chrono::Utc; use std::{thread::sleep, time::Duration}; #[derive(Clone)] struct S; impl Drop for S { fn drop(&mut self) { sleep(Duration::from_millis(1)); println!("drop!"); } } impl S { pub fn do_sth(&self) { println!("do_sth"); } } #[test] fn it_works() { let a = vec![S; 10]; a[0].do_sth(); let t1 = Utc::now().timestamp_millis(); drop(a); let t2 = Utc::now().timestamp_millis(); println!("drop cost time: {}ms", t2 - t1); } #[tokio::test] async fn async_works() { let a = AsyncDestruction::new(vec![S; 10]); a[0].do_sth(); let t1 = Utc::now().timestamp_millis(); drop(a); let t2 = Utc::now().timestamp_millis(); println!("drop cost time: {}ms", t2 - t1); } }