Struct MemFixedAllocator 

pub struct MemFixedAllocator { /* private fields */ }

A two-phase bump allocator for fixed-size, aligned sub-regions.

Usage

1. Pre-allocation phase — call pre_alloc_data repeatedly to accumulate the total size needed.
2. Call alloc_data once to allocate the backing buffer.
3. Allocation phase — call alloc_data to hand out sub-slices from the backing buffer.

Implementations

impl MemFixedAllocator

pub fn new() -> Self

Creates a new allocator with the default alignment.

pub fn pre_alloc_data(&mut self, size: usize, _count: usize)

Phase 1: registers that size bytes (with alignment) will be needed.

pub fn finalize(&mut self) -> Result<()>

Allocates the single backing buffer based on the accumulated size.

pub fn alloc_data(&mut self, size: usize) -> Result<*mut u8>

Phase 2: hands out the next size-byte slice from the backing buffer.

Safety

The returned pointer is valid for the lifetime of this allocator. The caller must ensure size matches a prior pre_alloc_data call.

Trait Implementations

impl Default for MemFixedAllocator

fn default() -> Self

Returns the “default value” for a type.