Enum OptionUsize 

#[repr(C, u8)]
pub enum OptionUsize {
    None,
    Some(usize),
}

Variants

None

Some(usize)

Implementations

impl OptionUsize

pub fn into_option(&self) -> Option<usize>

impl OptionUsize

pub fn as_option(&self) -> Option<&usize>

pub fn replace(&mut self, value: usize) -> OptionUsize

pub fn is_some(&self) -> bool

pub fn is_none(&self) -> bool

pub const fn as_ref(&self) -> Option<&usize>

pub fn as_mut(&mut self) -> Option<&mut usize>

pub fn map<U, F: FnOnce(usize) -> U>(self, f: F) -> Option<U>

pub fn and_then<U, F>(self, f: F) -> Option<U>

where F: FnOnce(usize) -> Option<U>,

Trait Implementations

impl Clone for OptionUsize

fn clone(&self) -> OptionUsize

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OptionUsize

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

Formats the value using the given formatter.

impl Default for OptionUsize

fn default() -> OptionUsize

Returns the “default value” for a type.

impl From<Option<usize>> for OptionUsize

fn from(o: Option<usize>) -> OptionUsize

Converts to this type from the input type.

impl From<OptionUsize> for Option<usize>

fn from(o: OptionUsize) -> Option<usize>

Converts to this type from the input type.

impl Hash for OptionUsize

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 Ord for OptionUsize

fn cmp(&self, other: &OptionUsize) -> Ordering

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for OptionUsize

fn eq(&self, other: &OptionUsize) -> 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 PartialOrd for OptionUsize

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Copy for OptionUsize

impl Eq for OptionUsize

impl StructuralPartialEq for OptionUsize