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/Rust

Struct std::option::NoneError

pub struct NoneError;
🔬 This is a nightly-only experimental API. (try_trait #42327)

The error type that results from applying the try operator (?) to a None value. If you wish to allow x? (where x is an Option<T>) to be converted into your error type, you can implement impl From<NoneError> for YourErrorType. In that case, x? within a function that returns Result<_, YourErrorType> will translate a None value into an Err result.

Trait Implementations

impl Copy for NoneError[src]

impl Hash for NoneError[src]

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, [src]1.3.0

Feeds a slice of this type into the given [Hasher]. Read more

impl Clone for NoneError[src]

fn clone_from(&mut self, source: &Self)[src]1.0.0

Performs copy-assignment from source. Read more

impl Eq for NoneError[src]

impl PartialOrd<NoneError> for NoneError[src]

fn lt(&self, other: &Rhs) -> bool[src]1.0.0

This method tests less than (for self and other) and is used by the < operator. Read more

fn le(&self, other: &Rhs) -> bool[src]1.0.0

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

fn gt(&self, other: &Rhs) -> bool[src]1.0.0

This method tests greater than (for self and other) and is used by the > operator. Read more

fn ge(&self, other: &Rhs) -> bool[src]1.0.0

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl Ord for NoneError[src]

fn max(self, other: Self) -> Self[src]1.21.0

Compares and returns the maximum of two values. Read more

fn min(self, other: Self) -> Self[src]1.21.0

Compares and returns the minimum of two values. Read more

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

🔬 This is a nightly-only experimental API. (clamp #44095)

Restrict a value to a certain interval. Read more

impl Debug for NoneError[src]

impl PartialEq<NoneError> for NoneError[src]

fn ne(&self, other: &Rhs) -> bool[src]1.0.0

This method tests for !=.

Auto Trait Implementations

impl UnwindSafe for NoneError

impl RefUnwindSafe for NoneError

impl Unpin for NoneError

impl Send for NoneError

impl Sync for NoneError

Blanket Implementations

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

impl<T> From<T> for T[src]

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

ⓘImportant traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized, 
    type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized, 
    type Item = <I as Iterator>::Item;
impl<'_, R: Read + ?Sized> Read for &'_ mut R
impl<'_, W: Write + ?Sized> Write for &'_ mut W

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

ⓘImportant traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized, 
    type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
    I: Iterator + ?Sized, 
    type Item = <I as Iterator>::Item;
impl<'_, R: Read + ?Sized> Read for &'_ mut R
impl<'_, W: Write + ?Sized> Write for &'_ mut W

impl<T> Any for T where
    T: 'static + ?Sized, [src]

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/option/struct.NoneError.html