Struct relative::Vtable

pub struct Vtable<T: ?Sized>(_, _);

Wraps &'static references to vtables such that they can be safely sent between other processes running the same binary.

For references into the segment that houses the vtables, typically the read-only data segment aka rodata.

The base used is the vtable of a static trait object:

#[used]
#[no_mangle]
pub static RELATIVE_VTABLE_BASE: &(dyn Any + Sync) = &();

let base = transmute::<*const dyn Any, std::raw::TraitObject>(RELATIVE_VTABLE_BASE).vtable as usize;

Methods

impl<T: ?Sized> Vtable<T>

pub unsafe fn from(ptr: &'static ()) -> Self

Create a Vtable<T> from a &'static ().

Safety

This is unsafe as it is up to the user to ensure the pointer lies within static memory.

i.e. the pointer needs to be positioned the same relative to the base in every invocation, through e.g. being in the same segment, or the binary being statically linked.

pub fn to(&self) -> &'static ()

Get back a &'static () from a Vtable<T>.

Trait Implementations

impl<T: ?Sized> Clone for Vtable<T>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: ?Sized> Copy for Vtable<T>

impl<T: ?Sized> Eq for Vtable<T>

impl<T: ?Sized> Ord for Vtable<T>

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl<T: ?Sized> PartialEq<Vtable<T>> for Vtable<T>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<T: ?Sized> PartialOrd<Vtable<T>> for Vtable<T>

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

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

#[must_use] fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use] fn le(&self, other: &Rhs) -> bool

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

#[must_use] fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use] fn ge(&self, other: &Rhs) -> bool

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

impl<T: ?Sized> Debug for Vtable<T>

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

Formats the value using the given formatter.

impl<T: ?Sized> Hash for Vtable<T>

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, 

Feeds a slice of this type into the given [Hasher].

impl<T: ?Sized + 'static> Serialize for Vtable<T>

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where
    S: Serializer, 

Serialize this value into the given Serde serializer.

impl<'de, T: ?Sized + 'static> Deserialize<'de> for Vtable<T>

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where
    D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.