pub struct Global;
🔬This is a nightly-only experimental API. (
allocator_api
#32838)Expand description
The global memory allocator.
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.
Note: while this type is unstable, the functionality it provides can be
accessed through the free functions in alloc
.
Trait Implementations§
source§impl Allocator for Global
impl Allocator for Global
source§fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>
fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>
🔬This is a nightly-only experimental API. (
allocator_api
#32838)Attempts to allocate a block of memory. Read more
source§fn allocate_zeroed(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>
fn allocate_zeroed(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>
🔬This is a nightly-only experimental API. (
allocator_api
#32838)Behaves like
allocate
, but also ensures that the returned memory is zero-initialized. Read moresource§unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout)
unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout)
🔬This is a nightly-only experimental API. (
allocator_api
#32838)Deallocates the memory referenced by
ptr
. Read moresource§unsafe fn grow(
&self,
ptr: NonNull<u8>,
old_layout: Layout,
new_layout: Layout
) -> Result<NonNull<[u8]>, AllocError>
unsafe fn grow( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout ) -> Result<NonNull<[u8]>, AllocError>
🔬This is a nightly-only experimental API. (
allocator_api
#32838)Attempts to extend the memory block. Read more
source§unsafe fn grow_zeroed(
&self,
ptr: NonNull<u8>,
old_layout: Layout,
new_layout: Layout
) -> Result<NonNull<[u8]>, AllocError>
unsafe fn grow_zeroed( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout ) -> Result<NonNull<[u8]>, AllocError>
🔬This is a nightly-only experimental API. (
allocator_api
#32838)Behaves like
grow
, but also ensures that the new contents are set to zero before being
returned. Read moreimpl Copy for Global
Auto Trait Implementations§
impl RefUnwindSafe for Global
impl Send for Global
impl Sync for Global
impl Unpin for Global
impl UnwindSafe for Global
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more