Struct std::ptr::DynMetadata[][src]

#[lang = "dyn_metadata"]
pub struct DynMetadata<Dyn> where
    Dyn: ?Sized
{ /* fields omitted */ }
🔬 This is a nightly-only experimental API. (ptr_metadata #81513)

The metadata for a Dyn = dyn SomeTrait trait object type.

It is a pointer to a vtable (virtual call table) that represents all the necessary information to manipulate the concrete type stored inside a trait object. The vtable notably it contains:

Note that the first three are special because they’re necessary to allocate, drop, and deallocate any trait object.

It is possible to name this struct with a type parameter that is not a dyn trait object (for example DynMetadata<u64>) but not to obtain a meaningful value of that struct.

Implementations

impl<Dyn> DynMetadata<Dyn> where
    Dyn: ?Sized
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pub fn size_of(self) -> usize[src]

🔬 This is a nightly-only experimental API. (ptr_metadata #81513)

Returns the size of the type associated with this vtable.

pub fn align_of(self) -> usize[src]

🔬 This is a nightly-only experimental API. (ptr_metadata #81513)

Returns the alignment of the type associated with this vtable.

pub fn layout(self) -> Layout[src]

🔬 This is a nightly-only experimental API. (ptr_metadata #81513)

Returns the size and alignment together as a Layout

Trait Implementations

impl<Dyn> Clone for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Copy for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Debug for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Eq for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Hash for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Ord for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> PartialEq<DynMetadata<Dyn>> for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> PartialOrd<DynMetadata<Dyn>> for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Send for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Sync for DynMetadata<Dyn> where
    Dyn: ?Sized
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impl<Dyn> Unpin for DynMetadata<Dyn> where
    Dyn: ?Sized
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Auto Trait Implementations

impl<Dyn: ?Sized> RefUnwindSafe for DynMetadata<Dyn> where
    Dyn: RefUnwindSafe

impl<Dyn: ?Sized> UnwindSafe for DynMetadata<Dyn> where
    Dyn: UnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

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.

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.