From 7c336c87695955a222e9e6d3d55987e6539c8c50 Mon Sep 17 00:00:00 2001
From: Aaron Kaiser <a_kaiser@posteo.de>
Date: Tue, 7 May 2024 10:34:42 +0200
Subject: [PATCH] feat: get rid of lifetime annotations

---
 src/sharedptr.rs | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/src/sharedptr.rs b/src/sharedptr.rs
index 5c70540..8750384 100644
--- a/src/sharedptr.rs
+++ b/src/sharedptr.rs
@@ -1,24 +1,20 @@
 use core::slice;
-use std::{
-    ops::{Deref, DerefMut},
-    usize,
-};
+use std::ops::{Deref, DerefMut};
 
 use crate::allocator::ALLOCATOR;
 
 #[derive(Debug)]
-pub struct SharedPtr<'a, const N: usize>(&'a mut [u8; N]);
+pub struct SharedPtr<const N: usize>(*mut u8);
 
-impl<const N: usize> SharedPtr<'_, N> {
+unsafe impl<const N: usize> Send for SharedPtr<N> {}
+
+impl<const N: usize> SharedPtr<N> {
     pub fn new() -> Option<Self> {
         let mut allocator = ALLOCATOR.lock().unwrap();
 
-        let buf = unsafe {
-            let buf = allocator.allocate(N)?;
-            slice::from_raw_parts_mut(buf, N)
-        };
+        let buf = unsafe { allocator.allocate(N)? };
 
-        Some(SharedPtr(buf.try_into().expect("Should never fail")))
+        Some(SharedPtr(buf))
     }
 
     pub fn get_offset(&self) -> usize {
@@ -28,26 +24,34 @@ impl<const N: usize> SharedPtr<'_, N> {
     }
 }
 
-impl<'a, const N: usize> Deref for SharedPtr<'a, N> {
+impl<const N: usize> Deref for SharedPtr<N> {
     type Target = [u8; N];
 
     fn deref(&self) -> &Self::Target {
-        &self.0
+        unsafe {
+            slice::from_raw_parts(self.0, N)
+                .try_into()
+                .expect("This should never fail")
+        }
     }
 }
 
-impl<'a, const N: usize> DerefMut for SharedPtr<'a, N> {
+impl<const N: usize> DerefMut for SharedPtr<N> {
     fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
+        unsafe {
+            slice::from_raw_parts_mut(self.0, N)
+                .try_into()
+                .expect("This should never fail")
+        }
     }
 }
 
-impl<const N: usize> Drop for SharedPtr<'_, N> {
+impl<const N: usize> Drop for SharedPtr<N> {
     fn drop(&mut self) {
         let mut allocator = ALLOCATOR.lock().unwrap();
 
         unsafe {
-            allocator.deallocate(self.0.as_mut_ptr());
+            allocator.deallocate(self.0);
         }
     }
 }