Struct synstructure::BindingInfo[][src]

pub struct BindingInfo<'a> {
    pub binding: Ident,
    pub style: BindStyle,
    // some fields omitted
}
Expand description

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.

Implementations

Returns a reference to the underlying syn AST node which this BindingInfo references

Generates the pattern fragment for this field binding.

Example

let di: syn::DeriveInput = syn::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()
);

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 = syn::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(),
    &[&quote::format_ident!("T")]
);

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Write self to the given TokenStream. Read more

Convert self directly into a TokenStream object. Read more

Convert self directly into a TokenStream object. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

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

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.