Struct bevy_ptr::PtrMut

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pub struct PtrMut<'a, A: IsAligned = Aligned>(/* private fields */);
Expand description

Type-erased mutable borrow of some unknown type chosen when constructing this type.

This type tries to act “borrow-like” which means that:

  • Pointer is considered exclusive and mutable. It cannot be cloned as this would lead to aliased mutability.
  • It must always points to a valid value of whatever the pointee type is.
  • The lifetime 'a accurately represents how long the pointer is valid for.
  • Must be sufficiently aligned for the unknown pointee type.

It may be helpful to think of this type as similar to &'a mut dyn Any but without the metadata and able to point to data that does not correspond to a Rust type.

Implementations§

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impl<'a> PtrMut<'a, Aligned>

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pub fn to_unaligned(self) -> PtrMut<'a, Unaligned>

Removes the alignment requirement of this pointer

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impl<A: IsAligned> PtrMut<'_, A>

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pub unsafe fn byte_offset(self, count: isize) -> Self

Calculates the offset from a pointer. As the pointer is type-erased, there is no size information available. The provided count parameter is in raw bytes.

See also: ptr::offset

§Safety
  • The offset cannot make the existing ptr null, or take it out of bounds for its allocation.
  • If the A type parameter is Aligned then the offset must not make the resulting pointer be unaligned for the pointee type.
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pub unsafe fn byte_add(self, count: usize) -> Self

Calculates the offset from a pointer (convenience for .offset(count as isize)). As the pointer is type-erased, there is no size information available. The provided count parameter is in raw bytes.

See also: ptr::add

§Safety
  • The offset cannot make the existing ptr null, or take it out of bounds for its allocation.
  • If the A type parameter is Aligned then the offset must not make the resulting pointer be unaligned for the pointee type.
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impl<'a, A: IsAligned> PtrMut<'a, A>

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pub unsafe fn new(inner: NonNull<u8>) -> Self

Creates a new instance from a raw pointer.

§Safety
  • inner must point to valid value of whatever the pointee type is.
  • If the A type parameter is Aligned then inner must be sufficiently aligned for the pointee type.
  • inner must have correct provenance to allow read and writes of the pointee type.
  • The lifetime 'a must be constrained such that this PtrMut will stay valid and nothing else can read or mutate the pointee while this PtrMut is live.
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pub unsafe fn promote(self) -> OwningPtr<'a, A>

Transforms this PtrMut into an OwningPtr

§Safety

Must have right to drop or move out of PtrMut.

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pub unsafe fn deref_mut<T>(self) -> &'a mut T

Transforms this PtrMut<T> into a &mut T with the same lifetime

§Safety
  • T must be the erased pointee type for this PtrMut.
  • If the type parameter A is Unaligned then this pointer must be sufficiently aligned for the pointee type T.
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pub fn as_ptr(&self) -> *mut u8

Gets the underlying pointer, erasing the associated lifetime.

If possible, it is strongly encouraged to use deref_mut over this function, as it retains the lifetime.

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pub fn reborrow(&mut self) -> PtrMut<'_, A>

Gets a PtrMut from this with a smaller lifetime.

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pub fn as_ref(&self) -> Ptr<'_, A>

Gets an immutable reference from this mutable reference

Trait Implementations§

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impl<'a, T> From<&'a mut T> for PtrMut<'a>

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fn from(val: &'a mut T) -> Self

Converts to this type from the input type.
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impl<'a, A: IsAligned> From<PtrMut<'a, A>> for NonNull<u8>

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fn from(ptr: PtrMut<'a, A>) -> Self

Converts to this type from the input type.
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impl<A: IsAligned> Pointer for PtrMut<'_, A>

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

Formats the value using the given formatter.

Auto Trait Implementations§

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impl<'a, A> RefUnwindSafe for PtrMut<'a, A>
where A: RefUnwindSafe,

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impl<'a, A = Aligned> !Send for PtrMut<'a, A>

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impl<'a, A = Aligned> !Sync for PtrMut<'a, A>

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impl<'a, A> Unpin for PtrMut<'a, A>
where A: Unpin,

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impl<'a, A = Aligned> !UnwindSafe for PtrMut<'a, A>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.