Struct syn::Attribute [] [src]

pub struct Attribute {
    pub pound_token: Pound,
    pub style: AttrStyle,
    pub bracket_token: Bracket,
    pub path: Path,
    pub tts: TokenStream,
    pub is_sugared_doc: bool,
}

An attribute like #[repr(transparent)].

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

Syntax

Rust has six types of attributes.

The style field of type AttrStyle distinguishes whether an attribute is outer or inner. Doc comments and block comments are promoted to attributes that have is_sugared_doc set to true, as this is how they are processed by the compiler and by macro_rules! macros.

The path field gives the possibly colon-delimited path against which the attribute is resolved. It is equal to "doc" for desugared doc comments. The tts field contains the rest of the attribute body as tokens.

#[derive(Copy)]      #[crate::precondition x < 5]
  ^^^^^^~~~~~~         ^^^^^^^^^^^^^^^^^^^ ~~~~~
   path  tts                   path         tts

Use the interpret_meta method to try parsing the tokens of an attribute into the structured representation that is used by convention across most Rust libraries.

Fields

Methods

impl Attribute
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impl Attribute
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Parses the tokens after the path as a Meta if possible.

Trait Implementations

impl ToTokens for Attribute
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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

impl Debug for Attribute
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Formats the value using the given formatter. Read more

impl Clone for Attribute
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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 Eq for Attribute
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impl PartialEq for Attribute
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This method tests for self and other values to be equal, and is used by ==. Read more

1.0.0
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This method tests for !=.

impl Hash for Attribute
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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