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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]

Returns a copy of the value. Read more

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

Performs copy-assignment from source. Read more

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

`fn partial_cmp(&self, __arg_0: &NoneError) -> Option<Ordering>` [src]

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

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

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

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

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`
1.0.0
[src]

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

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

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

`impl Eq for NoneError` [src]

`impl Hash for NoneError` [src]

`fn hash<H>(&self, arg_0: &mut H) where H: Hasher,` [src]

Feeds this value into the given [Hasher]. Read more

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

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

`impl Copy for NoneError` [src]

`impl Ord for NoneError` [src]

`fn cmp(&self, __arg_0: &NoneError) -> Ordering` [src]

This method returns an Ordering between self and other. Read more

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

Compares and returns the maximum of two values. Read more

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

Compares and returns the minimum of two values. Read more

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

`fn eq(&self, __arg_0: &NoneError) -> bool` [src]

This method tests for self and other values to be equal, and is used by ==. Read more

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

This method tests for !=.

`impl Debug for NoneError` [src]

`fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>` [src]

Formats the value using the given formatter. Read more

© 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) 1.0.0 [src]

impl PartialOrd<NoneError> for NoneError [src]

fn partial_cmp(&self, __arg_0: &NoneError) -> Option<Ordering> [src]

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

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

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

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

impl Eq for NoneError [src]

impl Hash for NoneError [src]

fn hash<__H>(&self, __arg_0: &mut __H) where __H: Hasher, [src]

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

impl Copy for NoneError [src]

impl Ord for NoneError [src]

fn cmp(&self, __arg_0: &NoneError) -> Ordering [src]

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

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

impl PartialEq<NoneError> for NoneError [src]

fn eq(&self, __arg_0: &NoneError) -> bool [src]

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

impl Debug for NoneError [src]

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error> [src]