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:
-
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
.
-
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]
.
-
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]>
.
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Performs copy-assignment from source
. Read more
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True if self
has any late-bound regions that are either bound by binder
or bound by some binder outside of binder
. If binder
is ty::INNERMOST
, this indicates whether there are any late-bound regions that appear free. Read more
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True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
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"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more
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True if there any any un-erased free regions.
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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. Read more
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True if there are any late-bound regions
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A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
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Formats the value using the given formatter. Read more
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Creates owned data from borrowed data, usually by cloning. Read more
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recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
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The type returned in the event of a conversion error.
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Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
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The type returned in the event of a conversion error.
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Mutably borrows from an owned value. Read more
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this method will likely be replaced by an associated static
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more