Enum rustc_middle::ty::util::ExplicitSelf
source · 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>where
P: Fn(Ty<'tcx>) -> bool,
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§
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<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<'tcx, T> ToPredicate<'tcx, T> for T
impl<'tcx, T> ToPredicate<'tcx, T> for T
fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> 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: &[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 bytesByReference
: 15 bytesByRawPointer
: 1 byteByBox
: 0 bytesOther
: 0 bytes