pub enum ExplicitSelf<'tcx> {
ByValue,
ByReference(Region<'tcx>, Mutability),
ByRawPointer(Mutability),
ByBox,
Other,
}
Variants§
Implementations§
source§impl<'tcx> ExplicitSelf<'tcx>
impl<'tcx> ExplicitSelf<'tcx>
sourcepub fn determine<P>(self_arg_ty: Ty<'tcx>, is_self_ty: P) -> ExplicitSelf<'tcx>
pub fn determine<P>(self_arg_ty: Ty<'tcx>, is_self_ty: P) -> ExplicitSelf<'tcx>
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
dyn-incompatible.
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§
impl<'tcx> Freeze for ExplicitSelf<'tcx>
impl<'tcx> RefUnwindSafe for ExplicitSelf<'tcx>
impl<'tcx> Send for ExplicitSelf<'tcx>
impl<'tcx> Sync for ExplicitSelf<'tcx>
impl<'tcx> Unpin for ExplicitSelf<'tcx>
impl<'tcx> UnwindSafe for ExplicitSelf<'tcx>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<T> Filterable for T
impl<T> Filterable for T
source§fn filterable(
self,
filter_name: &'static str,
) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
Creates a filterable data provider with the given name for debugging. Read more
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§impl<P> IntoQueryParam<P> for P
impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
source§impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
source§impl<I, T> UpcastFrom<I, T> for T
impl<I, T> UpcastFrom<I, T> for T
fn upcast_from(from: T, _tcx: I) -> T
source§impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T
source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
impl<T> ErasedDestructor for Twhere
T: 'static,
impl<T> MaybeSendSync for 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 bytesByReference
: 15 bytesByRawPointer
: 1 byteByBox
: 0 bytesOther
: 0 bytes