Struct NeverAlloc

pub struct NeverAlloc;

NeverAlloc is an implementation for GlobalAlloc , which always fails. For example, NeverAlloc::alloc always returns a null pointer.

Trait Implementations

impl Clone for NeverAlloc

fn clone(&self) -> NeverAlloc

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NeverAlloc

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

Formats the value using the given formatter.

impl Default for NeverAlloc

fn default() -> Self

Returns the “default value” for a type.

impl GlobalAlloc for NeverAlloc

unsafe fn alloc(&self, _layout: Layout) -> *mut u8

Allocates memory as described by the given layout.

unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout)

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

unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8

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

unsafe fn realloc( &self, ptr: *mut u8, layout: Layout, new_size: usize, ) -> *mut u8

Shrinks or grows a block of memory to the given new_size in bytes. The block is described by the given ptr pointer and layout.

impl Copy for NeverAlloc