Struct std::alloc::System

pub struct System;

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

Trait Implementations

impl GlobalAlloc for System

unsafe fn alloc(&self, layout: Layout) -> *mut Opaque

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Allocate memory as described by the given layout.

unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Opaque

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

unsafe fn dealloc(&self, ptr: *mut Opaque, _layout: Layout)

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Deallocate the block of memory at the given ptr pointer with the given layout.

unsafe fn realloc(     &self,     ptr: *mut Opaque,     layout: Layout,     new_size: usize ) -> *mut Opaque

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Shink or grow a block of memory to the given new_size. The block is described by the given ptr pointer and layout.

impl Alloc for System

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Deallocate the memory referenced by ptr.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Attempts to extend the allocation referenced by ptr to fit new_size.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Attempts to shrink the allocation referenced by ptr to fit new_size.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Allocates a block suitable for holding an instance of T.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Deallocates a block suitable for holding an instance of T.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Allocates a block suitable for holding n instances of T.

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

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

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

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

the precise API and guarantees it provides may be tweaked slightly, especially to possibly take into account the types being stored to make room for a future tracing garbage collector

Deallocates a block suitable for holding n instances of T.