## ExprFnSig

# Enum ExprFnSig

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    pub enum ExprFnSig<'tcx> {
        Sig(Binder<'tcx, FnSig<'tcx>>, Option<DefId>),
        Closure(Option<&'tcx FnDecl<'tcx>>, Binder<'tcx, FnSig<'tcx>>),
        Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>, Option<DefId>),
    }

Expand description

A signature for a function like type.

## Variants§

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### Sig(Binder<'tcx, FnSig<'tcx>>, Option<DefId>)

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### Closure(Option<&'tcx FnDecl<'tcx>>, Binder<'tcx, FnSig<'tcx>>)

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### Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>, Option<DefId>)

## Implementations§

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### impl<'tcx> ExprFnSig<'tcx>

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#### pub fn input(self, i: usize) -> Option<Binder<'tcx, Ty<'tcx>>>

Gets the argument type at the given offset. This will return `None` when the index is out of bounds only for variadic functions, otherwise this will panic.

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#### pub fn input_with_hir( self, i: usize, ) -> Option<(Option<&'tcx Ty<'tcx>>, Binder<'tcx, Ty<'tcx>>)>

Gets the argument type at the given offset. For closures this will also get the type as written. This will return `None` when the index is out of bounds only for variadic functions, otherwise this will panic.

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#### pub fn output(self) -> Option<Binder<'tcx, Ty<'tcx>>>

Gets the result type, if one could be found. Note that the result type of a trait may not be specified.

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#### pub fn predicates_id(&self) -> Option<DefId>

## Trait Implementations§

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### impl<'tcx> Clone for ExprFnSig<'tcx>

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#### fn clone(&self) -> ExprFnSig<'tcx>

Returns a duplicate of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl<'tcx> Debug for ExprFnSig<'tcx>

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl<'tcx> Copy for ExprFnSig<'tcx>

## Auto Trait Implementations§

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### impl<'tcx> Freeze for ExprFnSig<'tcx>

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### impl<'tcx> !RefUnwindSafe for ExprFnSig<'tcx>

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### impl<'tcx> Send for ExprFnSig<'tcx>

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### impl<'tcx> Sync for ExprFnSig<'tcx>

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### impl<'tcx> Unpin for ExprFnSig<'tcx>

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### impl<'tcx> !UnwindSafe for ExprFnSig<'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> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. 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> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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: 40 bytes

Size for each variant:

- `Sig`: 40 bytes
- `Closure`: 40 bytes
- `Trait`: 40 bytes