Struct alloc_wg::alloc::Global

[+] Show declaration

pub struct Global;

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

[−] Expand description

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[+]

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fn alloc(&mut self, layout: Layout) -> Result<NonNull<[u8]>, AllocErr>[−]

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

Attempts to allocate a block of memory.

fn alloc_zeroed(&mut self, layout: Layout) -> Result<NonNull<[u8]>, AllocErr>[−]

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

Behaves like alloc, but also ensures that the returned memory is zero-initialized.

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

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

Deallocates the memory referenced by ptr.

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

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

Attempts to extend the memory block.

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

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

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

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

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

Attempts to shrink the memory block.

fn by_ref(&mut self) -> &mut Self[−]

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

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

impl Clone for Global[+]

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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[+]

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

Formats the value using the given formatter.

impl Default for Global[+]

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fn default() -> Global[−]

Returns the "default value" for a type.