Struct System 

pub struct System;

Adapter exposing the standard System allocator as an forge_alloc_core::Allocator.

System does NOT implement forge_alloc_core::FixedRange (it owns no bounded region) nor forge_alloc_core::OsBacked (it does not expose page-level controls). This is intentional — wrappers requiring those traits cannot accidentally be applied to System.

Implementations

impl System

pub const fn new() -> Self

Construct. ZST — no fields.

Trait Implementations

impl Allocator for System

fn allocate(&self, layout: NonZeroLayout) -> Result<NonNull<[u8]>, AllocError>

Allocate a block satisfying layout. The returned slice’s length is at least layout.size() but may be larger.

fn allocate_zeroed( &self, layout: NonZeroLayout, ) -> Result<NonNull<[u8]>, AllocError>

Allocate a zero-initialized block.

unsafe fn grow( &self, ptr: NonNull<u8>, old: NonZeroLayout, new: NonZeroLayout, ) -> Result<NonNull<[u8]>, AllocError>

Grow an allocation in place if possible, otherwise allocate-copy-free.

unsafe fn shrink( &self, ptr: NonNull<u8>, old: NonZeroLayout, new: NonZeroLayout, ) -> Result<NonNull<[u8]>, AllocError>

Shrink an allocation in place if possible, otherwise allocate-copy-free.

fn reset(&mut self) -> Result<(), AllocError>

Reclaim everything previously allocated. Default impl returns AllocError — only arena-style allocators implement a meaningful reset.

unsafe fn usable_size( &self, _ptr: NonNull<u8>, _layout: NonZeroLayout, ) -> Option<usize>

Usable size of an existing allocation, if the allocator can report it. Defaults to None — implementors that track usable size override.

fn capacity_bytes(&self) -> Option<usize>

Total bytes this allocator can issue, if bounded. None for unbounded allocators like System. Used by Watermark to compute thresholds.

fn corruption_events(&self) -> u64

Detected freelist / metadata corruption events observed by this allocator since construction.

impl Clone for System

fn clone(&self) -> System

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for System

impl Deallocator for System

unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: NonZeroLayout)

Release a previously allocated block.

impl Debug for System

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for System

fn default() -> System

Returns the “default value” for a type.