Struct std::ptr::DynMetadata  
source · [−]pub struct DynMetadata<Dyn> where
    Dyn: ?Sized,  { /* private fields */ }Expand description
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:
- type size
- type alignment
- a pointer to the type’s drop_in_placeimpl (may be a no-op for plain-old-data)
- pointers to all the methods for the type’s implementation of the trait
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
Trait Implementations
sourceimpl<Dyn> Clone for DynMetadata<Dyn> where
    Dyn: ?Sized, 
 
impl<Dyn> Clone for DynMetadata<Dyn> where
    Dyn: ?Sized, 
sourcefn clone(&self) -> DynMetadata<Dyn>
 
fn clone(&self) -> DynMetadata<Dyn>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
 
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source. Read more
sourceimpl<Dyn> Debug for DynMetadata<Dyn> where
    Dyn: ?Sized, 
 
impl<Dyn> Debug for DynMetadata<Dyn> where
    Dyn: ?Sized, 
sourceimpl<Dyn> Hash for DynMetadata<Dyn> where
    Dyn: ?Sized, 
 
impl<Dyn> Hash for DynMetadata<Dyn> where
    Dyn: ?Sized, 
sourceimpl<Dyn> Ord for DynMetadata<Dyn> where
    Dyn: ?Sized, 
 
impl<Dyn> Ord for DynMetadata<Dyn> where
    Dyn: ?Sized, 
sourceimpl<Dyn> PartialEq<DynMetadata<Dyn>> for DynMetadata<Dyn> where
    Dyn: ?Sized, 
 
impl<Dyn> PartialEq<DynMetadata<Dyn>> for DynMetadata<Dyn> where
    Dyn: ?Sized, 
sourceimpl<Dyn> PartialOrd<DynMetadata<Dyn>> for DynMetadata<Dyn> where
    Dyn: ?Sized, 
 
impl<Dyn> PartialOrd<DynMetadata<Dyn>> for DynMetadata<Dyn> where
    Dyn: ?Sized, 
sourcefn partial_cmp(&self, other: &DynMetadata<Dyn>) -> Option<Ordering>
 
fn partial_cmp(&self, other: &DynMetadata<Dyn>) -> Option<Ordering>
This method returns an ordering between self and other values if one exists. Read more
1.0.0 · sourcefn lt(&self, other: &Rhs) -> bool
 
fn lt(&self, other: &Rhs) -> bool
This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · sourcefn le(&self, other: &Rhs) -> bool
 
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for self and other) and is used by the <=
operator. Read more
impl<Dyn> Copy for DynMetadata<Dyn> where
    Dyn: ?Sized, 
impl<Dyn> Eq for DynMetadata<Dyn> where
    Dyn: ?Sized, 
impl<Dyn> Send for DynMetadata<Dyn> where
    Dyn: ?Sized, 
impl<Dyn> Sync for DynMetadata<Dyn> where
    Dyn: ?Sized, 
impl<Dyn> Unpin for DynMetadata<Dyn> where
    Dyn: ?Sized, 
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
sourceimpl<T> BorrowMut<T> for T where
    T: ?Sized, 
 
impl<T> BorrowMut<T> for T where
    T: ?Sized, 
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
 
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
    T: Clone, 
 
impl<T> ToOwned for T where
    T: Clone, 
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
 
fn clone_into(&self, target: &mut T)
Uses borrowed data to replace owned data, usually by cloning. Read more