[−][src]Struct core::option::NoneError
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
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impl PartialEq<NoneError> for NoneError
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fn eq(&self, other: &NoneError) -> bool
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#[must_use]
fn ne(&self, other: &Rhs) -> bool
1.0.0[src]
This method tests for !=
.
impl Eq for NoneError
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impl Ord for NoneError
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fn cmp(&self, other: &NoneError) -> Ordering
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fn max(self, other: Self) -> Self where
Self: Sized,
1.21.0[src]
Self: Sized,
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self where
Self: Sized,
1.21.0[src]
Self: Sized,
Compares and returns the minimum of two values. Read more
fn clamp(self, min: Self, max: Self) -> Self where
Self: Sized,
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Self: Sized,
Restrict a value to a certain interval. Read more
impl PartialOrd<NoneError> for NoneError
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fn partial_cmp(&self, other: &NoneError) -> Option<Ordering>
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#[must_use]
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
#[must_use]
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
#[must_use]
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
#[must_use]
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 Clone for NoneError
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fn clone(&self) -> NoneError
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl Hash for NoneError
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fn hash<__H: Hasher>(&self, state: &mut __H)
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fn hash_slice<H: Hasher>(data: &[Self], state: &mut H) where
Self: Sized,
1.3.0[src]
Self: Sized,
Feeds a slice of this type into the given [Hasher
]. Read more
impl Debug for NoneError
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Auto Trait Implementations
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(Self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut Self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,