Enum Never 

pub enum Never {}

Never is a type that cannot be instantiated.

This is a bottom type.

Examples

use malachite_base::nevers::Never;

let _x: Option<Never> = None;

Trait Implementations

impl Clone for Never

fn clone(&self) -> Never

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Never

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

Formats the value using the given formatter.

impl Display for Never

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

Would convert a Never to a String.

impl FromStr for Never

fn from_str(_: &str) -> Result<Self, NeverError>

Would convert a String to a Never.

Since a Never can never be instantiated, from_str never succeeds.

Worst-case complexity

Constant time and additional memory.

Examples

use malachite_base::nevers::{Never, NeverError};
use std::str::FromStr;

assert_eq!(Never::from_str("abc"), Err(NeverError));

type Err = NeverError

The associated error which can be returned from parsing.

impl Hash for Never

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 Never

fn cmp(&self, other: &Never) -> 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 Never

fn eq(&self, other: &Never) -> 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 Never

fn partial_cmp(&self, other: &Never) -> 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 Never

impl Eq for Never

impl StructuralPartialEq for Never