Enum macroex::Either

pub enum Either<A: FromMacro, B: FromMacro> {
    A(A),
    B(B),
}

Matches one of many FromMacro implementors sequentially.

Note the input will be cloned for each branch, which might not be optimal.

Variants

A(A)

B(B)

Trait Implementations

impl<A: Debug + FromMacro, B: Debug + FromMacro> Debug for Either<A, B>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<A, B> Default for Either<A, B>

where A: Default + FromMacro, B: FromMacro,

fn default() -> Self

Returns the “default value” for a type.

impl<A, B> FromMacro for Either<A, B>

where A: FromMacro, B: FromMacro,

fn from_one(tt: TokenTree) -> Result<Self, Error>

This will be called if there is only one item

fn from_many(tokens: TokenStream) -> Result<Self, Error>

This will be called if there is more than one item.

const PREFER_MANY: bool = false

Hint to All and similar extractors to disable length validation.

fn peek(tt: &TokenTree) -> bool

Look ahead and determine parsability.

impl<A, B> ToTokens for Either<A, B>

where A: FromMacro + ToTokens, B: FromMacro + ToTokens,

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.