Struct ptr_meta::DynMetadata

pub struct DynMetadata<Dyn: ?Sized> { /* private fields */ }

The metadata for a trait object.

This struct wraps a pointer to a vtable (virtual method table) which contains all of the necessary information to manipulate the concrete type stored inside of the trait object:

• The size and alignment of the concrete type
• A function pointer to the type’s drop_in_place impl
• Function pointers for each method in the concrete type’s trait implementation

Providing a type argument that is not a dyn trait object is possible, but does not correspond with a meaningful type.

Implementations

impl<Dyn: ?Sized> DynMetadata<Dyn>

pub fn size_of(self) -> usize

Returns the size of the type associated with this metadata.

pub fn align_of(self) -> usize

Returns the alignment of the type associated with this metadata.

pub fn layout(self) -> Layout

Returns the layout of the type associated with this metadata.

Trait Implementations

impl<Dyn: ?Sized> Clone for DynMetadata<Dyn>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Dyn: ?Sized> Debug for DynMetadata<Dyn>

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

Formats the value using the given formatter.

impl<Dyn: ?Sized> Hash for DynMetadata<Dyn>

fn hash<H: Hasher>(&self, hasher: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<Dyn: ?Sized> Ord for DynMetadata<Dyn>

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl<Dyn: ?Sized> PartialEq for DynMetadata<Dyn>

fn eq(&self, other: &Self) -> 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<Dyn: ?Sized> PartialOrd for DynMetadata<Dyn>

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<Dyn: ?Sized> Copy for DynMetadata<Dyn>

impl<Dyn: ?Sized> Eq for DynMetadata<Dyn>

impl<Dyn: ?Sized> Send for DynMetadata<Dyn>

impl<Dyn: ?Sized> Sync for DynMetadata<Dyn>

impl<Dyn: ?Sized> Unpin for DynMetadata<Dyn>