add Slabable trait

src/datastructures/queue.rs

@@ -1,8 +1,11 @@
+use std::collections::HashSet;
 use std::marker::PhantomData;
+use std::mem::size_of;
 use std::ops::Range;
 
 use zerocopy::{AsBytes, FromBytes, FromZeroes, Unaligned};
 
+use crate::mapped::Slabable;
 use crate::ReaderTrait;
 use crate::{transaction, FilePointer, TransactionHandle, U64};
 
@@ -14,6 +17,13 @@ pub struct Queue<T: FromBytes + FromZeroes + AsBytes + Unaligned + Clone + Copy>
     _phantom: PhantomData<T>,
 }
 
+impl<T: FromBytes + FromZeroes + AsBytes + Unaligned + Clone + Copy> Slabable for Queue<T> {
+    fn slabs(slabs: &mut HashSet<u32>) {
+        slabs.insert(size_of::<Queue<T>>() as u32);
+        slabs.insert(size_of::<QueueElement<T>>() as u32);
+    }
+}
+
 impl<T: FromBytes + FromZeroes + AsBytes + Unaligned + Clone + Copy> Queue<T> {
     pub fn new<R>(transaction: &mut TransactionHandle<R>) -> FilePointer<Queue<T>> {
         let (queue, data) = transaction.allocate();

src/datastructures/string.rs

@@ -1,7 +1,10 @@
+use std::{collections::HashSet, mem::size_of};
+
 use zerocopy::{AsBytes, FromBytes, FromZeroes, Unaligned};
 
 use crate::{
-    transaction, FilePointer, FileRange, RawFilePointer, ReaderTrait, TransactionHandle, U64,
+    mapped::Slabable, transaction, FilePointer, FileRange, RawFilePointer, ReaderTrait,
+    TransactionHandle, U64,
 };
 
 use super::vector::Vector;
@@ -10,6 +13,12 @@ use super::vector::Vector;
 #[repr(transparent)]
 pub struct Str(Vector);
 
+impl Slabable for Str {
+    fn slabs(slabs: &mut HashSet<u32>) {
+        slabs.insert(size_of::<Str>() as u32);
+    }
+}
+
 impl Str {
     pub fn new() -> Self {
         Self(Vector::new())

src/datastructures/vector.rs

@@ -1,7 +1,10 @@
+use std::{collections::HashSet, mem::size_of};
+
 use zerocopy::{AsBytes, FromBytes, FromZeroes, Unaligned};
 
 use crate::{
-    transaction, FilePointer, FileRange, RawFilePointer, ReaderTrait, TransactionHandle, U64,
+    mapped::Slabable, transaction, FilePointer, FileRange, RawFilePointer, ReaderTrait,
+    TransactionHandle, U64,
 };
 
 #[derive(Clone, Copy, FromBytes, FromZeroes, AsBytes, Unaligned)]
@@ -10,6 +13,12 @@ pub struct Vector {
     data: FileRange,
 }
 
+impl Slabable for Vector {
+    fn slabs(slabs: &mut HashSet<u32>) {
+        slabs.insert(size_of::<Vector>() as u32);
+    }
+}
+
 impl Vector {
     pub fn new() -> Self {
         Self {

src/mapped.rs

@@ -1,4 +1,5 @@
 use std::{
+    collections::HashSet,
     mem::{align_of, size_of},
     ops::Deref,
     sync::Arc,
@@ -33,3 +34,7 @@ where
         self.deref().read_raw(range)
     }
 }
+
+pub trait Slabable {
+    fn slabs(slabs: &mut HashSet<u32>);
+}