Struct MutableHandle 

#[repr(C)]
pub struct MutableHandle<T> {
    pub _phantom_0: PhantomData<UnsafeCell<T>>,
    pub ptr: *mut T,
}

Similar to a handle, but the underlying storage can be changed. This is useful for outparams.

If you want to add additional methods to MutableHandle for a specific specialization, define a MutableHandleOperations specialization containing them.

Fields

_phantom_0: PhantomData<UnsafeCell<T>>

ptr: *mut T

Implementations

impl<T> MutableHandle<T>

pub unsafe fn from_marked_location(ptr: *mut T) -> MutableHandle<T>

pub fn handle(&self) -> Handle<T>

pub fn get(&self) -> T

where T: Copy,

pub fn set(&self, v: T)

where T: Copy,

pub fn as_ptr(self) -> *mut T

The returned pointer is aliased by a pointer that the GC will read through, and thus &mut references created from it must not be held across GC pauses.

Trait Implementations

impl<T> Clone for MutableHandle<T>

where T: Clone,

fn clone(&self) -> MutableHandle<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Debug for MutableHandle<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Deref for MutableHandle<T>

type Target = T

The resulting type after dereferencing.

fn deref<'a>(&'a self) -> &'a T

Dereferences the value.

impl<T> From<T> for MutableHandle<<T as IntoHandle>::Target>

where T: IntoMutableHandle,

fn from(value: T) -> MutableHandle<<T as IntoHandle>::Target>

Converts to this type from the input type.

impl<T> PartialEq for MutableHandle<T>

where T: PartialEq,

fn eq(&self, other: &MutableHandle<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> Copy for MutableHandle<T>

where T: Copy,

impl<T> StructuralPartialEq for MutableHandle<T>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes