[−][src]Struct picollar::local::OptionSeverity
Methods from Deref<Target = Option<Severity>>
#[must_use =
"if you intended to assert that this has a value, consider `.unwrap()` instead"]pub fn is_some(&self) -> bool
1.0.0[src]
Returns true
if the option is a Some
value.
Examples
let x: Option<u32> = Some(2); assert_eq!(x.is_some(), true); let x: Option<u32> = None; assert_eq!(x.is_some(), false);
#[must_use =
"if you intended to assert that this doesn't have a value, consider \
`.and_then(|| panic!(\"`Option` had a value when expected `None`\"))` instead"]pub fn is_none(&self) -> bool
1.0.0[src]
Returns true
if the option is a None
value.
Examples
let x: Option<u32> = Some(2); assert_eq!(x.is_none(), false); let x: Option<u32> = None; assert_eq!(x.is_none(), true);
#[must_use]pub fn contains<U>(&self, x: &U) -> bool where
U: PartialEq<T>,
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U: PartialEq<T>,
option_result_contains
)Returns true
if the option is a Some
value containing the given value.
Examples
#![feature(option_result_contains)] let x: Option<u32> = Some(2); assert_eq!(x.contains(&2), true); let x: Option<u32> = Some(3); assert_eq!(x.contains(&2), false); let x: Option<u32> = None; assert_eq!(x.contains(&2), false);
pub fn as_ref(&self) -> Option<&T>
1.0.0[src]
Converts from &Option<T>
to Option<&T>
.
Examples
Converts an Option<
String
>
into an Option<
usize
>
, preserving the original.
The map
method takes the self
argument by value, consuming the original,
so this technique uses as_ref
to first take an Option
to a reference
to the value inside the original.
let text: Option<String> = Some("Hello, world!".to_string()); // First, cast `Option<String>` to `Option<&String>` with `as_ref`, // then consume *that* with `map`, leaving `text` on the stack. let text_length: Option<usize> = text.as_ref().map(|s| s.len()); println!("still can print text: {:?}", text);
pub fn as_pin_ref(self: Pin<&Option<T>>) -> Option<Pin<&T>>
1.33.0[src]
pub fn as_pin_mut(self: Pin<&mut Option<T>>) -> Option<Pin<&mut T>>
1.33.0[src]
pub fn iter(&self) -> Iter<T>
1.0.0[src]
Returns an iterator over the possibly contained value.
Examples
let x = Some(4); assert_eq!(x.iter().next(), Some(&4)); let x: Option<u32> = None; assert_eq!(x.iter().next(), None);
pub fn as_deref(&self) -> Option<&<T as Deref>::Target>
1.40.0[src]
Converts from Option<T>
(or &Option<T>
) to Option<&T::Target>
.
Leaves the original Option in-place, creating a new one with a reference
to the original one, additionally coercing the contents via Deref
.
Examples
let x: Option<String> = Some("hey".to_owned()); assert_eq!(x.as_deref(), Some("hey")); let x: Option<String> = None; assert_eq!(x.as_deref(), None);
Trait Implementations
impl Clone for OptionSeverity
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fn clone(&self) -> OptionSeverity
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fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl Copy for OptionSeverity
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impl Debug for OptionSeverity
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impl Deref for OptionSeverity
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type Target = Option<Severity>
The resulting type after dereferencing.
fn deref(&self) -> &Self::Target
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impl Eq for OptionSeverity
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impl From<Option<Severity>> for OptionSeverity
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impl FromStr for OptionSeverity
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type Err = UnknownSeverity
The associated error which can be returned from parsing.
fn from_str(s: &str) -> Result<OptionSeverity, UnknownSeverity>
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impl PartialEq<OptionSeverity> for OptionSeverity
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fn eq(&self, other: &OptionSeverity) -> bool
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fn ne(&self, other: &OptionSeverity) -> bool
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impl StructuralEq for OptionSeverity
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impl StructuralPartialEq for OptionSeverity
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Auto Trait Implementations
impl RefUnwindSafe for OptionSeverity
impl Send for OptionSeverity
impl Sync for OptionSeverity
impl Unpin for OptionSeverity
impl UnwindSafe for OptionSeverity
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T, I> AsResult<T, I> for T where
I: Input,
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I: Input,
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<Q, K> Equivalent<K> for Q where
K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
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K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
fn equivalent(&self, key: &K) -> bool
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> IntoCollection<T> for T
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fn into_collection<A>(self) -> SmallVec<A> where
A: Array<Item = T>,
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A: Array<Item = T>,
fn mapped<U, F, A>(self, f: F) -> SmallVec<A> where
A: Array<Item = U>,
F: FnMut(T) -> U,
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A: Array<Item = U>,
F: FnMut(T) -> U,
impl<T> Same<T> for T
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type Output = T
Should always be Self
impl<T> Slottable for T where
T: Copy,
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T: Copy,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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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(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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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> Typeable for T where
T: Any,
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T: Any,