Enum proc_easy::EasyMaybe

pub enum EasyMaybe<T> {
    Nothing,
    Just(T),
}

Similar to Option but implements Parse when T implements EasyPeek

If stream doesn’t start as T then no tokens are consumed and EasyMaybe::Nothing is returned. Otherwise T is parsed and returned wrapped in EasyMaybe::Just.

Variants

Nothing

Nothing at all

Just(T)

Just a value

Trait Implementations

impl<T: Clone> Clone for EasyMaybe<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for EasyMaybe<T>

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

Formats the value using the given formatter.

impl<T> Default for EasyMaybe<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: Hash> Hash for EasyMaybe<T>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T: Ord> Ord for EasyMaybe<T>

fn cmp(&self, other: &EasyMaybe<T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl<T> Parse for EasyMaybe<T>where T: EasyPeek,

fn parse(input: ParseStream<'_>) -> Result<Self>

impl<T: PartialEq> PartialEq<EasyMaybe<T>> for EasyMaybe<T>

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl<T: PartialOrd> PartialOrd<EasyMaybe<T>> for EasyMaybe<T>

fn partial_cmp(&self, other: &EasyMaybe<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: Copy> Copy for EasyMaybe<T>

impl<T: Eq> Eq for EasyMaybe<T>

impl<T> StructuralEq for EasyMaybe<T>

impl<T> StructuralPartialEq for EasyMaybe<T>