Struct Parentheses 

pub struct Parentheses<T = TokenStream> {
    pub span: DelimSpan,
    pub contents: T,
}

( T )

Fields

span: DelimSpan

contents: T

Implementations

impl<T> Parentheses<T>

pub fn map<U>(self, f: impl FnOnce(T) -> U) -> Parentheses<U>

Maps self.contents using f.

pub fn try_map<U, E>( self, f: impl FnOnce(T) -> Result<U, E>, ) -> Result<Parentheses<U>, Parentheses<E>>

Tries to map self.contents using f.

impl<T, E> Parentheses<Result<T, E>>

pub fn transpose(self) -> Result<Parentheses<T>, Parentheses<E>>

Lifts an inner Result out of self. (The Parentheses “sinks” into the variants.)

Trait Implementations

impl<T: Clone> Clone for Parentheses<T>

fn clone(&self) -> Parentheses<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: IntoTokens> IntoTokens for Parentheses<T>

fn into_tokens(self, root: &TokenStream, tokens: &mut impl Extend<TokenTree>)

Emits self’s tokens into tokens while referencing root.

fn collect_tokens<T>(self, root: &TokenStream) -> T

where T: Default + Extend<TokenTree>, Self: Sized,

Convenience methods to emit self’s tokens into a new T.

impl<T: PeekFrom> PeekFrom for Parentheses<T>

Checks for the delimiters and contents.

fn peek_from(input: &Input) -> bool

Returns

impl<T: PopFrom> PopFrom for Parentheses<T>

fn pop_from(input: &mut Input, errors: &mut Errors) -> Result<Self, ()>

Tries to parse Self from an Input, optionally emitting to Errors.

fn peek_pop_from( input: &mut Input, errors: &mut Errors, ) -> Result<Option<Self>, ()>

where Self: Sized + PeekFrom,

Convenience function for <Option<Self> as PopFrom>::pop_from.