Crate without_alloc
source · [−]Expand description
Dynamic data structures that do not require a global allocator.
The most directly useful might be a local FixedVec that requires its element to be neither
Clone, Copy nor Default but is simply a normal vector on a locally borrowed chunk of raw
memory. For this we will use the Bump allocator of static-alloc which loan us memory from
the stack and cleans up by leaving the scope without requiring explicit deallocation. Sort of
like alloca but safe and pretty.
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 a mutable reference, not `Copy` nor `Clone`!
vector.push(&mut num);
*vector.pop().unwrap() = 4;
drop(vector);
assert_eq!(num, 4);