pub enum ExplicitSelf<'tcx> {
    ByValue,
    ByReference(Region<'tcx>, Mutability),
    ByRawPointer(Mutability),
    ByBox,
    Other,
}

Variants§

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ByValue

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ByReference(Region<'tcx>, Mutability)

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ByRawPointer(Mutability)

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ByBox

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Other

Implementations§

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impl<'tcx> ExplicitSelf<'tcx>

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pub fn determine<P>(self_arg_ty: Ty<'tcx>, is_self_ty: P) -> ExplicitSelf<'tcx>
where P: Fn(Ty<'tcx>) -> bool,

Categorizes an explicit self declaration like self: SomeType into either self, &self, &mut self, Box<Self>, or Other. This is mainly used to require the arbitrary_self_types feature in the case of Other, to improve error messages in the common cases, and to make Other non-object-safe.

Examples:

impl<'a> Foo for &'a T {
    // Legal declarations:
    fn method1(self: &&'a T); // ExplicitSelf::ByReference
    fn method2(self: &'a T); // ExplicitSelf::ByValue
    fn method3(self: Box<&'a T>); // ExplicitSelf::ByBox
    fn method4(self: Rc<&'a T>); // ExplicitSelf::Other

    // Invalid cases will be caught by `check_method_receiver`:
    fn method_err1(self: &'a mut T); // ExplicitSelf::Other
    fn method_err2(self: &'static T) // ExplicitSelf::ByValue
    fn method_err3(self: &&T) // ExplicitSelf::ByReference
}

Auto Trait Implementations§

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impl<'tcx> DynSend for ExplicitSelf<'tcx>

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impl<'tcx> DynSync for ExplicitSelf<'tcx>

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impl<'tcx> RefUnwindSafe for ExplicitSelf<'tcx>

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impl<'tcx> Send for ExplicitSelf<'tcx>

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impl<'tcx> Sync for ExplicitSelf<'tcx>

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impl<'tcx> Unpin for ExplicitSelf<'tcx>

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impl<'tcx> UnwindSafe for ExplicitSelf<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where 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 T
where 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 T
where 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, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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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 T
where 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<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for T
where 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 T
where 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.
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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T

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:

  • ByValue: 0 bytes
  • ByReference: 15 bytes
  • ByRawPointer: 1 byte
  • ByBox: 0 bytes
  • Other: 0 bytes