Struct ValueRef

pub struct ValueRef<'a, V>
where
    V: ?Sized + HasDrop,
{ /* private fields */ }

A generic value reference into a buffer.

Implementations

impl<'a, V: HasDrop> ValueRef<'a, V>

pub fn new<T: Any + DropBytes>(typed: &'a T) -> ValueRef<'a, V>

where V: VTable<T>,

Create a new ValueRef from a typed reference.

impl<'a, V: ?Sized + HasDrop> ValueRef<'a, V>

pub fn size(&self) -> usize

Get the size of the value pointed-to by this reference.

pub fn value_type_id(&self) -> TypeId

Get the TypeId of the referenced value.

pub fn value_alignment(&self) -> usize

Get the alignment of the referenced value.

pub fn is<T: 'static>(&self) -> bool

Returns true if this referenced value’s type is the same as T.

pub fn clone_value(&self) -> Value<Box<[MaybeUninit<u8>]>, V>

where V: HasClone + Clone,

Clone the referenced value.

Unlike the Clone trait, this function will produce an owned clone of the value pointed to by this value reference.

pub fn clone_small_value(&self) -> Value<MaybeUninit<usize>, V>

where V: HasClone + Clone,

Clone the referenced value.

Unlike the Clone trait, this function will produce an owned clone of the value pointed to by this value reference.

This version of clone_value tries to fit the underlying value into a usize sized value, and panics if that fails.

pub fn downcast<T: 'static>(self) -> Option<&'a T>

Downcast this value reference into a borrowed T type. Return None if the downcast fails.

pub fn upcast<U: ?Sized + HasDrop + From<V>>(self) -> ValueRef<'a, U>

where V: Clone,

pub fn upcast_ref<U: ?Sized + HasDrop + From<V>>(&self) -> ValueRef<'_, U>

where V: Clone,

pub fn reborrow(&self) -> ValueRef<'_, V>

An alternative to Clone that doesn’t require cloning the vtable.

Trait Implementations

impl<'a, V> Clone for ValueRef<'a, V>

where V: ?Sized + HasDrop + Clone,

fn clone(&self) -> ValueRef<'a, V>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a, V: ?Sized + HasDebug + HasDrop> Debug for ValueRef<'a, V>

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

Formats the value using the given formatter.

impl<'a, B, V> From<&'a Value<B, V>> for ValueRef<'a, V>

where B: GetBytesRef + GetBytesMut + DropAsAligned, V: ?Sized + Clone + HasDrop,

fn from(val: &'a Value<B, V>) -> Self

Converts to this type from the input type.

impl<'a, V: Any + Clone> From<CopyValueRef<'a, V>> for ValueRef<'a, (DropFn, V)>

fn from(v: CopyValueRef<'a, V>) -> ValueRef<'a, (DropFn, V)>

Converts to this type from the input type.

impl<'a, V: HasDrop> From<ValueMut<'a, V>> for ValueRef<'a, V>

fn from(v: ValueMut<'a, V>) -> ValueRef<'a, V>

Converts to this type from the input type.

impl<'a, V: HasDrop> From<ValueRef<'a, V>> for Meta<VTableRef<'a, V>>

fn from(val: ValueRef<'a, V>) -> Meta<VTableRef<'a, V>>

Converts to this type from the input type.

impl<'a, V: ?Sized + HasHash + HasDrop> Hash for ValueRef<'a, V>

fn hash<H: Hasher>(&self, state: &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<'a, V: ?Sized + HasPartialEq + HasDrop> PartialEq for ValueRef<'a, V>

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<'a, V: ?Sized + HasEq + HasDrop> Eq for ValueRef<'a, V>

impl<'a, V: ?Sized + HasSend + HasDrop> Send for ValueRef<'a, V>

impl<'a, V: ?Sized + HasSync + HasDrop> Sync for ValueRef<'a, V>