Struct First

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

最初に出現するSomeを返す演算。

Tuple Fields

0: Option<T>

Trait Implementations

impl<T> BinaryOp for First<T>

fn op(self, b: Self) -> Self

二項演算

fn op_assign_r(&mut self, b: Self)

where Self: Clone,

二項演算$\circ$で(右側から)代入操作($a \leftarrow a \circ b$)をする。

fn op_assign_l(&mut self, b: Self)

where Self: Clone,

二項演算$\circ$で(左側から)代入操作($a \leftarrow b \circ a$)をする。

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

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

Returns a copy 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> Identity for First<T>

fn id() -> Self

単位元

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

fn eq(&self, other: &First<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> Associative for First<T>

impl<T: Copy> Copy for First<T>

impl<T: Eq> Eq for First<T>

impl<T> Idempotence for First<T>

impl<T> Set for First<T>

impl<T> StructuralPartialEq for First<T>