Struct rustc::ty::adjustment::Adjustment

pub struct Adjustment<'tcx> {
    pub kind: Adjust<'tcx>,
    pub target: Ty<'tcx>,
}

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Represents coercing a value to a different type of value.

We transform values by following a number of Adjust steps in order. See the documentation on variants of Adjust for more details.

Here are some common scenarios:

1. The simplest cases are where a pointer is not adjusted fat vs thin. Here the pointer will be dereferenced N times (where a dereference can happen to raw or borrowed pointers or any smart pointer which implements Deref, including Box<_>). The types of dereferences is given by autoderefs. It can then be auto-referenced zero or one times, indicated by autoref, to either a raw or borrowed pointer. In these cases unsize is false.

2. A thin-to-fat coercion involves unsizing the underlying data. We start with a thin pointer, deref a number of times, unsize the underlying data, then autoref. The 'unsize' phase may change a fixed length array to a dynamically sized one, a concrete object to a trait object, or statically sized struct to a dynamically sized one. E.g., &[i32; 4] -> &[i32] is represented by:

Deref(None) -> [i32; 4],
Borrow(AutoBorrow::Ref) -> &[i32; 4],
Unsize -> &[i32],

Note that for a struct, the 'deep' unsizing of the struct is not recorded. E.g., struct Foo<T> { x: T } we can coerce &Foo<[i32; 4]> to &Foo<[i32]> The autoderef and -ref are the same as in the above example, but the type stored in unsize is Foo<[i32]>, we don't store any further detail about the underlying conversions from [i32; 4] to [i32].

1. Coercing a Box<T> to Box<Trait> is an interesting special case. In that case, we have the pointer we need coming in, so there are no autoderefs, and no autoref. Instead we just do the Unsize transformation. At some point, of course, Box should move out of the compiler, in which case this is analogous to transforming a struct. E.g., Box<[i32; 4]> -> Box<[i32]> is an Adjust::Unsize with the target Box<[i32]>.

Fields

kind: Adjust<'tcx>

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target: Ty<'tcx>

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Trait Implementations

impl<'tcx> HashStable<StableHashingContext<'tcx>> for Adjustment<'tcx>

fn hash_stable<W: StableHasherResult>(
    &self,
    __ctx: &mut StableHashingContext<'tcx>,
    __hasher: &mut StableHasher<W>
)

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impl<'tcx> Clone for Adjustment<'tcx>

fn clone(&self) -> Adjustment<'tcx>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Encodable for Adjustment<'tcx>

fn encode<__S: Encoder>(&self, __arg_0: &mut __S) -> Result<(), __S::Error>

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impl<'tcx> Decodable for Adjustment<'tcx>

fn decode<__D: Decoder>(
    __arg_0: &mut __D
) -> Result<Adjustment<'tcx>, __D::Error>

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impl<'a, 'tcx> Lift<'tcx> for Adjustment<'a>

type Lifted = Adjustment<'tcx>

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fn lift_to_tcx<'b, 'gcx>(
    &self,
    tcx: TyCtxt<'b, 'gcx, 'tcx>
) -> Option<Self::Lifted>

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impl<'tcx> TypeFoldable<'tcx> for Adjustment<'tcx>

fn super_fold_with<'gcx: 'tcx, V: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut V
) -> Self

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fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> Self

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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn has_regions_escaping_depth(&self, depth: u32) -> bool

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fn has_escaping_regions(&self) -> bool

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_projections(&self) -> bool

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fn references_error(&self) -> bool

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fn has_param_types(&self) -> bool

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fn has_self_ty(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn needs_infer(&self) -> bool

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fn needs_subst(&self) -> bool

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fn has_re_skol(&self) -> bool

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fn has_closure_types(&self) -> bool

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fn has_erasable_regions(&self) -> bool

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fn is_normalized_for_trans(&self) -> bool

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fn is_global(&self) -> bool

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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Errs on the side of returning false.

impl<'tcx> Print for Adjustment<'tcx>

fn print<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_to_string(&self, cx: &mut PrintContext) -> String

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fn print_display<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_display_to_string(&self, cx: &mut PrintContext) -> String

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fn print_debug<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_debug_to_string(&self, cx: &mut PrintContext) -> String

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impl<'tcx> Debug for Adjustment<'tcx>

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

Formats the value using the given formatter.