pub enum BuiltinImplSource {
    Misc,
    Object {
        vtable_base: usize,
    },
    TraitUpcasting {
        vtable_vptr_slot: Option<usize>,
    },
    TupleUnsizing,
}

Variants§

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Misc

Some builtin impl we don’t need to differentiate. This should be used unless more specific information is necessary.

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Object

Fields

§vtable_base: usize

A builtin impl for trait objects.

The vtable is formed by concatenating together the method lists of the base object trait and all supertraits, pointers to supertrait vtable will be provided when necessary; this is the start of upcast_trait_ref’s methods in that vtable.

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TraitUpcasting

Fields

§vtable_vptr_slot: Option<usize>

The vtable is formed by concatenating together the method lists of the base object trait and all supertraits, pointers to supertrait vtable will be provided when necessary; this is the position of upcast_trait_ref’s vtable within that vtable.

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TupleUnsizing

Unsizing a tuple like (A, B, ..., X) to (A, B, ..., Y) if X unsizes to Y.

This needs to be a separate variant as it is still unstable and we need to emit a feature error when using it on stable.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes

Size for each variant:

  • Misc: 0 bytes
  • Object: 16 bytes
  • TraitUpcasting: 16 bytes
  • TupleUnsizing: 0 bytes