Struct synstructure::BindingInfo
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pub struct BindingInfo<'a> { pub binding: Ident, pub style: BindStyle, // some fields omitted }
Information about a specific binding. This contains both an Ident
reference to the given field, and the syn &'a Field
descriptor for that
field.
This type supports quote::ToTokens
, so can be directly used within the
quote!
macro. It expands to a reference to the matched field.
Fields
binding: Ident
The name which this BindingInfo will bind to.
style: BindStyle
The type of binding which this BindingInfo will create.
Methods
impl<'a> BindingInfo<'a>
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pub fn ast(&self) -> &'a Field
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Returns a reference to the underlying syn
AST node which this
BindingInfo
references
pub fn pat(&self) -> TokenStream
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Generates the pattern fragment for this field binding.
Example
let di: syn::DeriveInput = parse_quote! { enum A { B{ a: i32, b: i32 }, C(u32), } }; let s = Structure::new(&di); assert_eq!( s.variants()[0].bindings()[0].pat().to_string(), quote! { ref __binding_0 }.to_string() );
pub fn referenced_ty_params(&self) -> Vec<&'a Ident>
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Returns a list of the type parameters which are referenced in this field's type.
Caveat
If the field contains any macros in type position, all parameters will be considered bound. This is because we cannot determine which type parameters are bound by type macros.
Example
let di: syn::DeriveInput = parse_quote! { struct A<T, U> { a: Option<T>, b: U, } }; let mut s = Structure::new(&di); assert_eq!( s.variants()[0].bindings()[0].referenced_ty_params(), &[&(syn::Ident::new("T", proc_macro2::Span::call_site()))] );
Trait Implementations
impl<'a> Debug for BindingInfo<'a>
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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<'a> Clone for BindingInfo<'a>
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fn clone(&self) -> BindingInfo<'a>
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl<'a> PartialEq for BindingInfo<'a>
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fn eq(&self, __arg_0: &BindingInfo<'a>) -> 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: &BindingInfo<'a>) -> bool
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This method tests for !=
.
impl<'a> Eq for BindingInfo<'a>
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impl<'a> Hash for BindingInfo<'a>
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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
impl<'a> ToTokens for BindingInfo<'a>
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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