Struct synstructure::BindingInfo [] [src]

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

The name which this BindingInfo will bind to.

The type of binding which this BindingInfo will create.

Methods

impl<'a> BindingInfo<'a>
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Returns a reference to the underlying syn AST node which this BindingInfo references

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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()
);

Important traits for Vec<u8>
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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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Formats the value using the given formatter. Read more

impl<'a> Clone for BindingInfo<'a>
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl<'a> PartialEq for BindingInfo<'a>
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This method tests for self and other values to be equal, and is used by ==. Read more

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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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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl<'a> ToTokens for BindingInfo<'a>
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Write self to the given TokenStream. Read more

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Convert self directly into a TokenStream object. Read more