Struct Number

pub struct Number<T>(pub T);

Specialized extractor for f32 and f64 that additionally accepts integers.

Examples

let mut value = 0.0f32;
Number(value) = quote!(1).into_iter().extract()?;
assert_eq!(value, 1.0);
All(Number(value)) = quote!(-1).into_iter().extract()?;
assert_eq!(value, -1.0);
Number(value) = quote!(1.0).into_iter().extract()?;
assert_eq!(value, 1.0);
All(Number(value)) = quote!(-1.0).into_iter().extract()?;
assert_eq!(value, -1.0);

Tuple Fields

0: T

Trait Implementations

impl<T: Clone> Clone for Number<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Number<T>

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

Formats the value using the given formatter.

impl<T: Default> Default for Number<T>

fn default() -> Number<T>

Returns the “default value” for a type.

impl FromMacro for Number<f32>

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 FromMacro for Number<f64>

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<T: PartialEq> PartialEq for Number<T>

fn eq(&self, other: &Number<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> ToTokens for Number<T>

where T: 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.

impl<T: Copy> Copy for Number<T>

impl<T> StructuralPartialEq for Number<T>