Struct alloc::alloc::Global

pub struct Global;

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

内存分配器。

此类型通过将调用转发到用 #[global_allocator] 属性注册的分配器 (如果有的话) 或 std crate 的默认值来实现 Allocator trait。

Note: 尽管此类型不稳定，但是可以通过 free functions in alloc 访问其提供的功能。

Trait Implementations

impl Allocator for Global

fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>

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

尝试分配一块内存。

fn allocate_zeroed(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>

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

行为类似于 allocate，但也确保返回的内存被零初始化。

unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout)

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

释放 ptr 引用的内存。

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)

尝试扩展内存块。

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)

行为类似于 grow，但也确保在返回新内容之前将其设置为零。

unsafe fn shrink(
    &self,
    ptr: NonNull<u8>,
    old_layout: Layout,
    new_layout: Layout
) -> Result<NonNull<[u8]>, AllocError>

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

尝试缩小内存块。

fn by_ref(&self) -> &Self

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

为此 Allocator 实例创建 “by reference” 适配器。

impl Clone for Global

fn clone(&self) -> Global

返回值的副本。

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

从 source 执行复制分配。

impl Debug for Global

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

使用给定的格式化程序格式化该值。

impl Default for Global

fn default() -> Global

返回类型的 “default value”。

impl Copy for Global