1.15.0[][src]Struct proc_macro::TokenStream

pub struct TokenStream(_);

The main type provided by this crate, representing an abstract stream of tokens, or, more specifically, a sequence of token trees. The type provide interfaces for iterating over those token trees and, conversely, collecting a number of token trees into one stream.

This is both the input and output of #[proc_macro], #[proc_macro_attribute] and #[proc_macro_derive] definitions.

Methods

impl TokenStream[src]

pub fn new() -> TokenStream1.29.0[src]

Returns an empty TokenStream containing no token trees.

pub fn is_empty(&self) -> bool1.29.0[src]

Checks if this TokenStream is empty.

Trait Implementations

impl IntoIterator for TokenStream1.29.0[src]

type Item = TokenTree

The type of the elements being iterated over.

type IntoIter = IntoIter

Which kind of iterator are we turning this into?

impl !Sync for TokenStream[src]

impl Clone for TokenStream[src]

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Extend<TokenTree> for TokenStream1.30.0[src]

impl Extend<TokenStream> for TokenStream1.30.0[src]

impl From<TokenTree> for TokenStream1.29.0[src]

Creates a token stream containing a single token tree.

impl ToString for TokenStream[src]

impl !Send for TokenStream[src]

impl Display for TokenStream[src]

Prints the token stream as a string that is supposed to be losslessly convertible back into the same token stream (modulo spans), except for possibly TokenTree::Groups with Delimiter::None delimiters and negative numeric literals.

impl Debug for TokenStream[src]

Prints token in a form convenient for debugging.

impl FromStr for TokenStream[src]

Attempts to break the string into tokens and parse those tokens into a token stream. May fail for a number of reasons, for example, if the string contains unbalanced delimiters or characters not existing in the language. All tokens in the parsed stream get Span::call_site() spans.

NOTE: some errors may cause panics instead of returning LexError. We reserve the right to change these errors into LexErrors later.

type Err = LexError

The associated error which can be returned from parsing.

impl FromIterator<TokenTree> for TokenStream1.29.0[src]

Collects a number of token trees into a single stream.

impl FromIterator<TokenStream> for TokenStream[src]

A "flattening" operation on token streams, collects token trees from multiple token streams into a single stream.

Auto Trait Implementations

impl Unpin for TokenStream

impl UnwindSafe for TokenStream

impl RefUnwindSafe for TokenStream

Blanket Implementations

impl<I> IntoIterator for I where
    I: Iterator
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type Item = <I as Iterator>::Item

The type of the elements being iterated over.

type IntoIter = I

Which kind of iterator are we turning this into?

impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> ToString for T where
    T: Display + ?Sized
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impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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