Struct syn::Generics
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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 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>
Methods
impl Generics
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pub fn type_params(&self) -> TypeParams
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Returns an
Iterator<Item = &
TypeParam
>
over the type parameters in self.params
.
pub fn type_params_mut(&mut self) -> TypeParamsMut
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Returns an
Iterator<Item = &mut
TypeParam
>
over the type parameters in self.params
.
pub fn lifetimes(&self) -> Lifetimes
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Returns an
Iterator<Item = &
LifetimeDef
>
over the lifetime parameters in self.params
.
pub fn lifetimes_mut(&mut self) -> LifetimesMut
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Returns an
Iterator<Item = &mut
LifetimeDef
>
over the lifetime parameters in self.params
.
pub fn const_params(&self) -> ConstParams
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Returns an
Iterator<Item = &
ConstParam
>
over the constant parameters in self.params
.
pub fn const_params_mut(&mut self) -> ConstParamsMut
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Returns an
Iterator<Item = &mut
ConstParam
>
over the constant parameters in self.params
.
pub fn make_where_clause(&mut self) -> &mut WhereClause
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Initializes an empty where
-clause if there is not one present already.
impl Generics
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pub fn split_for_impl(
&self
) -> (ImplGenerics, TypeGenerics, Option<&WhereClause>)
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&self
) -> (ImplGenerics, TypeGenerics, Option<&WhereClause>)
Split a type's generics into the pieces required for impl'ing a trait for that type.
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl(); quote! { impl #impl_generics MyTrait for #name #ty_generics #where_clause { // ... } }
This method is available if Syn is built with the "derive"
or
"full"
feature and the "printing"
feature.
Trait Implementations
impl Synom for Generics
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fn parse(i: Cursor) -> PResult<Self>
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fn description() -> Option<&'static str>
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A short name of the type being parsed. Read more
impl ToTokens for Generics
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fn to_tokens(&self, tokens: &mut TokenStream)
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Write self
to the given TokenStream
. Read more
fn into_token_stream(self) -> TokenStream
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Convert self
directly into a TokenStream
object. Read more
impl Default for Generics
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impl Debug for Generics
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fn fmt(&self, __arg_0: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl Eq for Generics
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impl PartialEq for Generics
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fn eq(&self, __arg_0: &Generics) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Generics) -> bool
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This method tests for !=
.
impl Hash for Generics
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fn hash<__H: Hasher>(&self, __arg_0: &mut __H)
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Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more