Struct alloc::alloc::Global

pub struct Global;

🔬 This is a nightly-only experimental API. (allocator_api #32838)

The global memory allocator.

This type implements the AllocRef trait by forwarding calls to the allocator registered with the #[global_allocator] attribute if there is one, or the std crate’s default.

Note: while this type is unstable, the functionality it provides can be accessed through the free functions in alloc.

Trait Implementations

impl AllocRef for Global

fn alloc(
    &mut self,
    layout: Layout,
    init: AllocInit
) -> Result<MemoryBlock, AllocErr>

🔬 This is a nightly-only experimental API. (allocator_api #32838)

Attempts to allocate a block of memory.

unsafe fn dealloc(&mut self, ptr: NonNull<u8>, layout: Layout)

🔬 This is a nightly-only experimental API. (allocator_api #32838)

Deallocates the memory referenced by ptr.

unsafe fn grow(
    &mut self,
    ptr: NonNull<u8>,
    layout: Layout,
    new_size: usize,
    placement: ReallocPlacement,
    init: AllocInit
) -> Result<MemoryBlock, AllocErr>

🔬 This is a nightly-only experimental API. (allocator_api #32838)

Attempts to extend the memory block.

unsafe fn shrink(
    &mut self,
    ptr: NonNull<u8>,
    layout: Layout,
    new_size: usize,
    placement: ReallocPlacement
) -> Result<MemoryBlock, AllocErr>

🔬 This is a nightly-only experimental API. (allocator_api #32838)

Attempts to shrink the memory block.

fn by_ref(&mut self) -> &mut Self

🔬 This is a nightly-only experimental API. (allocator_api #32838)

Creates a "by reference" adaptor for this instance of AllocRef.

impl Clone for Global

fn clone(&self) -> Global

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for Global

impl Debug for Global

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

Formats the value using the given formatter.

impl Default for Global

fn default() -> Global

Returns the "default value" for a type.