Struct Optional

pub struct Optional<Input>(pub Input);

optional defined in the grammar spec, allowing to match an optional Input.

See parse::optional() for the detailed grammar and examples.

Tuple Fields

0: Input

Trait Implementations

impl<Input> AsRef<Input> for Optional<Input>

fn as_ref(&self) -> &Input

Converts this type into a shared reference of the (usually inferred) input type.

impl<Input: Clone> Clone for Optional<Input>

fn clone(&self) -> Optional<Input>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<Input: Debug> Debug for Optional<Input>

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

Formats the value using the given formatter.

impl<Input> Deref for Optional<Input>

type Target = Input

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<Input> DerefMut for Optional<Input>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<I> IntoRegexCharIter<I> for Optional<I>

where I: Display + Input, <I as Input>::Item: AsChar,

Available on crate feature into-regex only.

type Iter = Map<Chain<Chain<Chars<'static>, EscapeForRegex<Map<<I as Input>::Iter, fn(<I as Input>::Item) -> char>>>, Chars<'static>>, fn(char) -> Result<char, ParameterError<I>>>

Type of Iterator performing the expansion.

fn into_regex_char_iter(self) -> Self::Iter

Consumes this AST element returning an Iterator over chars transformable into a Regex.

impl<Input: PartialEq> PartialEq for Optional<Input>

fn eq(&self, other: &Optional<Input>) -> 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<Input: Copy> Copy for Optional<Input>

impl<Input: Eq> Eq for Optional<Input>

impl<Input> StructuralPartialEq for Optional<Input>