frankencell/
tokens.rs

1use std::marker::PhantomData;
2
3use crate::cells::Cell;
4
5/// A generic token that can store any data. See examples/arena.rs for an example of how this could
6/// be used.
7pub struct TokenWith<T, const ID: usize> (
8    pub T,
9    PhantomData<()>,
10);
11
12impl<T, const ID: usize> TokenWith<T, ID> {
13    /// Creates a new token with this ID.
14    ///
15    /// # Safety:
16    /// Because tokens represent access (mutable or immutable) to a memory location, creating >1
17    /// tokens is equivalent to creating >1 mutable references to data.
18    pub const unsafe fn new(t: T) -> Self {
19        Self(t, PhantomData)
20    }
21
22    pub const fn cell(&self, t: T) -> Cell<T, ID> {
23        Cell::new(t)
24    }
25}
26
27
28/// A Token that represents access to one or more memory locations, each containing the same or
29/// different data types.
30///
31/// Currently, this crate only provides [Cell](crate::cells::Cell), but you may create your own
32/// ownership primitives. See examples/arena.rs for an example.
33pub type Token<const ID: usize> = TokenWith<(), ID>;
frankencell/tokens.rs

frankencell/
tokens.rs
