Struct Global

pub struct Global;

The global memory allocator.

When the alloc feature is enabled, this type implements the Allocator trait by forwarding calls to the allocator registered with the #[global_allocator] attribute if there is one, or the std crate’s default.

Trait Implementations

impl Allocator for Global

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

Try to allocate a slice of memory within this allocator instance, returning the new allocation.

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

Release an allocation produced by this allocator.

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

Try to allocate a slice of memory within this allocator instance, returning the new allocation. The memory will be initialized with zeroes.

unsafe fn grow( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocError>

Try to extend the size of an allocation to accomodate a new, larger layout.

unsafe fn grow_zeroed( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocError>

Try to extend the size of an allocation to accomodate a new, larger layout. Fill the extra capacity with zeros.

unsafe fn shrink( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocError>

Try to reduce the size of an allocation to accomodate a new, smaller layout.

fn by_ref(&self) -> &Self

where Self: Sized,

Obtain a reference to this allocator type.

impl AllocatorDefault for Global

const DEFAULT: Self = Global

The constant initializer for this allocator.

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 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.

impl PartialEq for Global

fn eq(&self, other: &Global) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Global

impl Eq for Global

impl StructuralPartialEq for Global