Struct BumpAlloc 

pub struct BumpAlloc<const N: usize> { /* private fields */ }

A fixed-size bump arena of N bytes.

dealloc is a no-op; space is reclaimed only by reset.

Implementations

impl<const N: usize> BumpAlloc<N>

pub const fn new() -> Self

pub unsafe fn reset(&self)

Free everything at once, making the arena usable again.

Safety

Every pointer previously handed out becomes dangling. Call only where no allocation from the previous run is still reachable — at an entry point, before any work.

pub fn used(&self) -> usize

High-water mark, in bytes. Useful for sizing an arena.

Trait Implementations

impl<const N: usize> Default for BumpAlloc<N>

fn default() -> Self

Returns the “default value” for a type.

impl<const N: usize> GlobalAlloc for BumpAlloc<N>

unsafe fn alloc(&self, layout: Layout) -> *mut u8

Allocates memory as described by the given layout.

unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout)

Deallocates the block of memory at the given ptr pointer with the given layout.

unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8

Behaves like alloc, but also ensures that the contents are set to zero before being returned.

unsafe fn realloc( &self, ptr: *mut u8, layout: Layout, new_size: usize, ) -> *mut u8

Shrinks or grows a block of memory to the given new_size in bytes. The block is described by the given ptr pointer and layout.

impl<const N: usize> Sync for BumpAlloc<N>