std::option::NoneError - 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 Clone for NoneError`[src]

`fn clone(&self) -> NoneError`[src]

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

`impl Copy for NoneError`[src]

`impl Debug for NoneError`[src]

`fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>`[src]

`impl Eq for NoneError`[src]

`impl Hash for NoneError`[src]

`fn hash<H>(&self, state: &mut H) where __H: Hasher,` [src]

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

`impl Ord for NoneError`[src]

`fn cmp(&self, other: &NoneError) -> Ordering`[src]

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

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

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

`impl PartialEq<NoneError> for NoneError`[src]

`fn eq(&self, other: &NoneError) -> bool`[src]

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

`impl PartialOrd<NoneError> for NoneError`[src]

`fn partial_cmp(&self, other: &NoneError) -> Option<Ordering>`[src]

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

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

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

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

`impl StructuralEq for NoneError`[src]

`impl StructuralPartialEq for NoneError`[src]

Blanket Implementations

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

`fn type_id(&self) -> TypeId`[src]

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

fn borrow(&self) -> &TⓘNotable 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

[src]

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

fn borrow_mut(&mut self) -> &mut TⓘNotable 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

[src]

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

`fn from(t: T) -> T`[src]

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

`fn into(self) -> U`[src]

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

`type Owned = T`

The resulting type after obtaining ownership.

`fn to_owned(&self) -> T`[src]

`fn clone_into(&self, target: &mut T)`[src]

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

`type Error = Infallible`

The type returned in the event of a conversion error.

`fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>`[src]

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

`type Error = >::Error`

The type returned in the event of a conversion error.

`fn try_into(self) -> Result<U, >::Error>`[src]

© 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

Struct std::option::NoneError

Trait Implementations

impl Clone for NoneError[src]

fn clone(&self) -> NoneError[src]

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

impl Copy for NoneError[src]

impl Debug for NoneError[src]

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

impl Eq for NoneError[src]

impl Hash for NoneError[src]

fn hash<__H>(&self, state: &mut __H) where __H: Hasher, [src]

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

impl Ord for NoneError[src]

fn cmp(&self, other: &NoneError) -> Ordering[src]

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

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

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

impl PartialEq<NoneError> for NoneError[src]

fn eq(&self, other: &NoneError) -> bool[src]

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

impl PartialOrd<NoneError> for NoneError[src]

fn partial_cmp(&self, other: &NoneError) -> Option<Ordering>[src]

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

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

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

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

impl StructuralEq for NoneError[src]

impl StructuralPartialEq for NoneError[src]

Auto Trait Implementations

impl RefUnwindSafe for NoneError

impl Send for NoneError

impl Sync for NoneError

impl Unpin for NoneError

impl UnwindSafe for NoneError

Blanket Implementations

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

fn type_id(&self) -> TypeId[src]

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

Notable traits for &'_ mut F

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

Notable traits for &'_ mut F

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

fn from(t: T) -> T[src]

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

fn into(self) -> U[src]

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

type Owned = T

fn to_owned(&self) -> T[src]

fn clone_into(&self, target: &mut T)[src]

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

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

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]