# Struct syn::Signature

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    pub struct Signature {
        pub constness: Option<Const>,
        pub asyncness: Option<Async>,
        pub unsafety: Option<Unsafe>,
        pub abi: Option<Abi>,
        pub fn_token: Fn,
        pub ident: Ident,
        pub generics: Generics,
        pub paren_token: Paren,
        pub inputs: Punctuated<FnArg, Comma>,
        pub variadic: Option<Variadic>,
        pub output: ReturnType,
    }

Expand description

A function signature in a trait or implementation: `unsafe fn initialize(&self)`.

This type is available only if Syn is built with the `"full"` feature.

## Fields

`constness: Option<Const>``asyncness: Option<Async>``unsafety: Option<Unsafe>``abi: Option<Abi>``fn_token: Fn` `ident: Ident` `generics: Generics` `paren_token: Paren` `inputs: Punctuated<FnArg, Comma>``variadic: Option<Variadic>``output: ReturnType`

## Implementations

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### impl Signature

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#### pub fn receiver(&self) -> Option<&FnArg>

A method’s `self` receiver, such as `&self` or `self: Box<Self>`.

## Trait Implementations

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### impl Clone for Signature

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#### fn clone(&self) -> Self

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from `source`. Read more

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### impl Parse for Signature

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#### fn parse(input: ParseStream<'_>) -> Result<Self>

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### impl ToTokens for Signature

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#### fn to_tokens(&self, tokens: &mut TokenStream)

Write `self` to the given `TokenStream`. Read more

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#### fn to_token_stream(&self) -> TokenStream

Convert `self` directly into a `TokenStream` object. Read more

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#### fn into_token_stream(self) -> TokenStream

Convert `self` directly into a `TokenStream` object. Read more

## Auto Trait Implementations

### impl RefUnwindSafe for Signature

### impl !Send for Signature

### impl !Sync for Signature

### impl Unpin for Signature

### impl UnwindSafe for Signature

## 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,

const: unstable · source

#### 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,

const: unstable · source

#### 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

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### 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> Spanned for T where
T: Spanned + ?Sized,

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#### fn span(&self) -> Span

Returns a `Span` covering the complete contents of this syntax tree node, or `Span::call_site()` if this node is empty. Read more

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### impl<T> ToOwned for T where
T: Clone,

#### 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>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### 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>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.