DerefDelegate in clippy_utils::sugg - Rust
Description: Visitor struct used for tracking down dereferencing and borrowing of closure’s args

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## DerefDelegate

# Struct DerefDelegate

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    struct DerefDelegate<'a, 'tcx> {
        cx: &'a LateContext<'tcx>,
        closure_span: Span,
        closure_arg_id: HirId,
        closure_arg_is_type_annotated_double_ref: bool,
        next_pos: BytePos,
        checked_borrows: FxHashSet<HirId>,
        suggestion_start: String,
        applicability: Applicability,
    }

Expand description

Visitor struct used for tracking down dereferencing and borrowing of closure’s args

## Fields§

§`cx: &'a LateContext<'tcx>`

The late context of the lint

§`closure_span: Span`

The span of the input closure to adapt

§`closure_arg_id: HirId`

The `hir_id` of the closure argument being checked

§`closure_arg_is_type_annotated_double_ref: bool`

Indicates if the arg of the closure is a type annotated double reference

§`next_pos: BytePos`

last position of the span to gradually build the suggestion

§`checked_borrows: FxHashSet<HirId>`

`hir_id`s that has been checked. This is used to avoid checking the same `hir_id` multiple times when inside macro expansions.

§`suggestion_start: String`

starting part of the gradually built suggestion

§`applicability: Applicability`

confidence on the built suggestion

## Implementations§

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### impl<'tcx> DerefDelegate<'_, 'tcx>

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#### pub fn finish(&mut self) -> String

build final suggestion:

- create the ending part of suggestion
- concatenate starting and ending parts
- potentially remove needless borrowing

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#### fn func_takes_arg_by_double_ref( &self, parent_expr: &'tcx Expr<'_>, cmt_hir_id: HirId, ) -> bool

indicates whether the function from `parent_expr` takes its args by double reference

## Trait Implementations§

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### impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx>

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#### fn consume(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId)

The value found at `place` is moved, depending on `mode`. Where `diag_expr_id` is the id used for diagnostics for `place`. Read more
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#### fn use_cloned(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId)

The value found at `place` is used, depending on `mode`. Where `diag_expr_id` is the id used for diagnostics for `place`. Read more
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#### fn borrow(&mut self, cmt: &PlaceWithHirId<'tcx>, _: HirId, _: BorrowKind)

The value found at `place` is being borrowed with kind `bk`. `diag_expr_id` is the id used for diagnostics (see `consume` for more details).
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#### fn mutate(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId)

The path at `assignee_place` is being assigned to. `diag_expr_id` is the id used for diagnostics (see `consume` for more details).
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#### fn fake_read(&mut self, _: &PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId)

The `place` should be a fake read because of specified `cause`.
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#### fn copy(&mut self, place_with_id: &PlaceWithHirId<'tcx>, diag_expr_id: HirId)

The value found at `place` is being copied. `diag_expr_id` is the id used for diagnostics (see `consume` for more details). Read more
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#### fn bind(&mut self, binding_place: &PlaceWithHirId<'tcx>, diag_expr_id: HirId)

The path at `binding_place` is a binding that is being initialized. Read more

## Auto Trait Implementations§

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### impl<'a, 'tcx> Freeze for DerefDelegate<'a, 'tcx>

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### impl<'a, 'tcx> !RefUnwindSafe for DerefDelegate<'a, 'tcx>

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### impl<'a, 'tcx> !Send for DerefDelegate<'a, 'tcx>

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### impl<'a, 'tcx> !Sync for DerefDelegate<'a, 'tcx>

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### impl<'a, 'tcx> Unpin for DerefDelegate<'a, 'tcx>

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### impl<'a, 'tcx> UnsafeUnpin for DerefDelegate<'a, 'tcx>

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### impl<'a, 'tcx> !UnwindSafe for DerefDelegate<'a, 'tcx>

## Blanket Implementations§

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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> 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<T> IntoEither for T

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#### 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 more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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 more
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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.

## 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: 88 bytes