# Struct std::alloc::Global[−][src]

    pub struct Global;

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

The global memory allocator.

This type implements the `Alloc` 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

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`impl Default for Global`

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`fn default() -> Global`

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Returns the "default value" for a type. Read more

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`impl Debug for Global`

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

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Formats the value using the given formatter. Read more

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`impl Clone for Global`

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`fn clone(&self) -> Global`

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Returns a copy of the value. Read more

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

1.0.0
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Performs copy-assignment from `source`. Read more

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`impl Copy for Global`

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`impl Alloc for Global`

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`unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<u8>, AllocErr>`

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

Returns a pointer meeting the size and alignment guarantees of `layout`. Read more

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

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

Deallocate the memory referenced by `ptr`. Read more

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`unsafe fn realloc( &mut self, ptr: NonNull<u8>, layout: Layout, new_size: usize ) -> Result<NonNull<u8>, AllocErr>`

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

Returns a pointer suitable for holding data described by a new layout with `layout`’s alginment and a size given by `new_size`. To accomplish this, this may extend or shrink the allocation referenced by `ptr` to fit the new layout. Read more

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`unsafe fn alloc_zeroed( &mut self, layout: Layout ) -> Result<NonNull<u8>, AllocErr>`

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

Behaves like `alloc`, but also ensures that the contents are set to zero before being returned. Read more

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`fn usable_size(&self, layout: &Layout) -> (usize, usize)`

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

Returns bounds on the guaranteed usable size of a successful allocation created with the specified `layout`. Read more

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`unsafe fn alloc_excess(&mut self, layout: Layout) -> Result<Excess, AllocErr>`

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

Behaves like `alloc`, but also returns the whole size of the returned block. For some `layout` inputs, like arrays, this may include extra storage usable for additional data. Read more

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`unsafe fn realloc_excess( &mut self, ptr: NonNull<u8>, layout: Layout, new_size: usize ) -> Result<Excess, AllocErr>`

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

Behaves like `realloc`, but also returns the whole size of the returned block. For some `layout` inputs, like arrays, this may include extra storage usable for additional data. Read more

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`unsafe fn grow_in_place( &mut self, ptr: NonNull<u8>, layout: Layout, new_size: usize ) -> Result<(), CannotReallocInPlace>`

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

Attempts to extend the allocation referenced by `ptr` to fit `new_size`. Read more

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`unsafe fn shrink_in_place( &mut self, ptr: NonNull<u8>, layout: Layout, new_size: usize ) -> Result<(), CannotReallocInPlace>`

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

Attempts to shrink the allocation referenced by `ptr` to fit `new_size`. Read more

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`fn alloc_one<T>(&mut self) -> Result<NonNull<T>, AllocErr>`

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

Allocates a block suitable for holding an instance of `T`. Read more

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`unsafe fn dealloc_one<T>(&mut self, ptr: NonNull<T>)`

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

Deallocates a block suitable for holding an instance of `T`. Read more

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`fn alloc_array<T>(&mut self, n: usize) -> Result<NonNull<T>, AllocErr>`

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

Allocates a block suitable for holding `n` instances of `T`. Read more

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`unsafe fn realloc_array<T>( &mut self, ptr: NonNull<T>, n_old: usize, n_new: usize ) -> Result<NonNull<T>, AllocErr>`

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

Reallocates a block previously suitable for holding `n_old` instances of `T`, returning a block suitable for holding `n_new` instances of `T`. Read more

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`unsafe fn dealloc_array<T>( &mut self, ptr: NonNull<T>, n: usize ) -> Result<(), AllocErr>`

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

Deallocates a block suitable for holding `n` instances of `T`. Read more

## Auto Trait Implementations

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`impl Send for Global`

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`impl Sync for Global`

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