feat: put lenght of SharedPtr buffer in type information

src/sharedptr.rs

@@ -7,15 +7,15 @@ use std::{
 use crate::allocator::ALLOCATOR;
 
 #[derive(Debug)]
-pub struct SharedPtr<'a>(&'a mut [u8]);
+pub struct SharedPtr<'a, const N: usize>(&'a mut [u8]);
 
-impl SharedPtr<'_> {
+impl<const N: usize> SharedPtr<'_, N> {
-    pub fn new(size: usize) -> Option<Self> {
+    pub fn new() -> Option<Self> {
         let mut allocator = ALLOCATOR.lock().unwrap();
 
         let buf = unsafe {
-            let buf = allocator.allocate(size)?;
+            let buf = allocator.allocate(N)?;
-            slice::from_raw_parts_mut(buf, size)
+            slice::from_raw_parts_mut(buf, N)
         };
 
         Some(SharedPtr(buf))
@@ -30,7 +30,7 @@ impl SharedPtr<'_> {
     }
 }
 
-impl<'a> Deref for SharedPtr<'a> {
+impl<'a, const N: usize> Deref for SharedPtr<'a, N> {
     type Target = &'a mut [u8];
 
     fn deref(&self) -> &Self::Target {
@@ -38,13 +38,13 @@ impl<'a> Deref for SharedPtr<'a> {
     }
 }
 
-impl<'a> DerefMut for SharedPtr<'a> {
+impl<'a, const N: usize> DerefMut for SharedPtr<'a, N> {
     fn deref_mut(&mut self) -> &mut Self::Target {
         &mut self.0
     }
 }
 
-impl Drop for SharedPtr<'_> {
+impl<const N: usize> Drop for SharedPtr<'_, N> {
     fn drop(&mut self) {
         let mut allocator = ALLOCATOR.lock().unwrap();
 
@@ -60,7 +60,7 @@ mod tests {
 
     #[test]
     fn test() {
-        let mut x = SharedPtr::new(10).unwrap();
+        let mut x = SharedPtr::<10>::new().unwrap();
         x[0] = 1;
         assert_eq!(x[0], 1);
         drop(x);