Struct std::option::NoneError

[+] Show type declaration

pub struct NoneError;

🔬 This is a nightly-only experimental API. (try_trait #42327)

[−] Expand description

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

impl Debug for NoneError

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

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Formats the value using the given formatter.

impl Ord for NoneError

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

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This method returns an Ordering between self and other.

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

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Compares and returns the maximum of two values.

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

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Compares and returns the minimum of two values.

impl Hash for NoneError

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

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Feeds this value into the given [Hasher].

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

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

impl PartialEq<NoneError> for NoneError

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

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

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

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This method tests for !=.

impl Clone for NoneError

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fn clone(&self) -> NoneError

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl PartialOrd<NoneError> for NoneError

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

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

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

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

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

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

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

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

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

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

impl Eq for NoneError