Struct First 

pub struct First<T>(pub Option<T>);

Tuple Fields

0: Option<T>

Trait Implementations

impl<T: Clone> Clone for First<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for First<T>

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

Formats the value using the given formatter.

impl<T: Default> Default for First<T>

fn default() -> First<T>

Returns the “default value” for a type.

impl<T> Extend<T> for First<T>

fn extend<I>(&mut self, iter: I)

where I: IntoIterator<Item = T>,

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: T)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl<T> FromItem<T> for First<T>

fn from_item(item: T) -> Self

impl<T: PartialEq> PartialEq for First<T>

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

Equality operator ==.

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

Inequality operator !=.

impl<T: PartialEq> StructuralPartialEq for First<T>