3 releases
0.2.2 | Oct 21, 2022 |
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0.2.1 | Jan 19, 2020 |
0.2.0 | Jan 17, 2020 |
#632 in Memory management
37,994 downloads per month
Used in 33 crates
(4 directly)
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2K
SLoC
without-alloc
Dynamic data structures that do not require a global allocator.
Usage
This allows creating dynamic and recursive data structures without dynamic
allocations. The example below makes use of the static-alloc
crate to build a
list with static lifetime based on dynamic data. As local memory pools for
fixed capacity FixedVec
:
use static_alloc::Bump;
use without_alloc::{FixedVec, alloc::LocalAllocLeakExt};
let mut pool: Bump<[usize; 16]> = Bump::uninit();
// Allocate a vector with capacity of 16 from the slab.
let mut vector = pool.fixed_vec(16).unwrap();
let mut num = 0;
// Push mutable ref, not `'static`, `Copy` nor `Clone`!
vector.push(&mut num);
*vector[0] = 42;
drop(vector);
assert_eq!(num, 42);
This might be handy if you want to chain boot another kernel and pass it a linked list describing the platform.
use static_alloc::Bump;
use without_alloc::{Box, alloc::LocalAllocLeakExt};
enum List {
Nil,
Cons(u8, Box<'static, List>),
}
static SLAB: Bump<[u8; 1024]> = Bump::uninit();
let base = SLAB.boxed(List::Nil).unwrap();
let one = SLAB.boxed(List::Cons(0, base)).unwrap();
let two = SLAB.boxed(List::Cons(1, one)).unwrap();