Struct syn::Generics

pub struct Generics {
    pub lt_token: Option<Lt>,
    pub params: Punctuated<GenericParam, Comma>,
    pub gt_token: Option<Gt>,
    pub where_clause: Option<WhereClause>,
}

Lifetimes and type parameters attached to a declaration of a function, enum, trait, etc.

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

Fields

lt_token: Option<Lt>

params: Punctuated<GenericParam, Comma>

gt_token: Option<Gt>

where_clause: Option<WhereClause>

Implementations

impl Generics

pub fn type_params(&self) -> TypeParams<'_>

Returns an Iterator<Item = &TypeParam> over the type parameters in self.params.

pub fn type_params_mut(&mut self) -> TypeParamsMut<'_>

Returns an Iterator<Item = &mut TypeParam> over the type parameters in self.params.

pub fn lifetimes(&self) -> Lifetimes<'_>

Returns an Iterator<Item = &LifetimeDef> over the lifetime parameters in self.params.

pub fn lifetimes_mut(&mut self) -> LifetimesMut<'_>

Returns an Iterator<Item = &mut LifetimeDef> over the lifetime parameters in self.params.

pub fn const_params(&self) -> ConstParams<'_>

Returns an Iterator<Item = &ConstParam> over the constant parameters in self.params.

pub fn const_params_mut(&mut self) -> ConstParamsMut<'_>

Returns an Iterator<Item = &mut ConstParam> over the constant parameters in self.params.

pub fn make_where_clause(&mut self) -> &mut WhereClause

Initializes an empty where-clause if there is not one present already.

Trait Implementations

impl Default for Generics

fn default() -> Self

Returns the “default value” for a type.

impl Parse for Generics

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