Struct loca::NullAllocator

pub struct NullAllocator(_);

Trait Implementations

impl Alloc for NullAllocator

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

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

unsafe fn dealloc(&mut self, _: NonNull<u8>, _: Layout)

Deallocate the memory referenced by ptr.

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

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

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

Returns a pointer suitable for holding data described by new_layout, meeting its size and alignment guarantees. To accomplish this, this may extend or shrink the allocation referenced by ptr to fit new_layout.

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

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

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

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<u8>,
    layout: Layout,
    new_size: usize
) -> Result<Excess, AllocErr>

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 resize_in_place(
    &mut self,
    ptr: NonNull<u8>,
    layout: Layout,
    new_size: usize
) -> Result<(), CannotReallocInPlace>

Attempts to resize the allocation referenced by ptr to fit new_layout.

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

Allocates a block suitable for holding an instance of T.

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

Deallocates a block suitable for holding an instance of T.

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

Allocates a block suitable for holding n instances of T.

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

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: Unique<T>,
    n: usize
) -> Result<(), AllocErr>

Deallocates a block suitable for holding n instances of T.

impl Clone for NullAllocator

fn clone(&self) -> NullAllocator

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NullAllocator

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

Formats the value using the given formatter.

impl Default for NullAllocator

fn default() -> NullAllocator

Returns the “default value” for a type.

impl Copy for NullAllocator