Struct wasmtime_environ::packed_option::PackedOption

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pub struct PackedOption<T>(/* private fields */)
where
    T: ReservedValue;
Expand description

Packed representation of Option<T>.

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impl<T> PackedOption<T>
where T: ReservedValue,

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pub fn is_none(&self) -> bool

Returns true if the packed option is a None value.

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pub fn is_some(&self) -> bool

Returns true if the packed option is a Some value.

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pub fn expand(self) -> Option<T>

Expand the packed option into a normal Option.

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pub fn map<U, F>(self, f: F) -> Option<U>
where F: FnOnce(T) -> U,

Maps a PackedOption<T> to Option<U> by applying a function to a contained value.

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pub fn unwrap(self) -> T

Unwrap a packed Some value or panic.

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pub fn expect(self, msg: &str) -> T

Unwrap a packed Some value or panic.

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pub fn take(&mut self) -> Option<T>

Takes the value out of the packed option, leaving a None in its place.

Trait Implementations§

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impl<T> Clone for PackedOption<T>
where T: Clone + ReservedValue,

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fn clone(&self) -> PackedOption<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Debug for PackedOption<T>
where T: ReservedValue + Debug,

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

Formats the value using the given formatter. Read more
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impl<T> Default for PackedOption<T>
where T: ReservedValue,

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fn default() -> PackedOption<T>

Create a default packed option representing None.

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impl<'de, T> Deserialize<'de> for PackedOption<T>
where T: ReservedValue + Deserialize<'de>,

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fn deserialize<__D>( __deserializer: __D, ) -> Result<PackedOption<T>, <__D as Deserializer<'de>>::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<T> From<Option<T>> for PackedOption<T>
where T: ReservedValue,

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fn from(opt: Option<T>) -> PackedOption<T>

Convert an option into its packed equivalent.

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impl<T> From<T> for PackedOption<T>
where T: ReservedValue,

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fn from(t: T) -> PackedOption<T>

Convert t into a packed Some(x).

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impl<T> Hash for PackedOption<T>
where T: Hash + ReservedValue,

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<T> Into<Option<T>> for PackedOption<T>
where T: ReservedValue,

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fn into(self) -> Option<T>

Converts this type into the (usually inferred) input type.
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impl<T> Ord for PackedOption<T>
where T: Ord + ReservedValue,

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fn cmp(&self, other: &PackedOption<T>) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl<T> PartialEq for PackedOption<T>

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fn eq(&self, other: &PackedOption<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> PartialOrd for PackedOption<T>

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fn partial_cmp(&self, other: &PackedOption<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

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

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fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<T> Copy for PackedOption<T>
where T: Copy + ReservedValue,

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impl<T> Eq for PackedOption<T>
where T: Eq + ReservedValue,

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impl<T> StructuralPartialEq for PackedOption<T>
where T: ReservedValue,

Auto Trait Implementations§

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impl<T> Freeze for PackedOption<T>
where T: Freeze,

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impl<T> RefUnwindSafe for PackedOption<T>
where T: RefUnwindSafe,

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impl<T> Send for PackedOption<T>
where T: Send,

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impl<T> Sync for PackedOption<T>
where T: Sync,

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impl<T> Unpin for PackedOption<T>
where T: Unpin,

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impl<T> UnwindSafe for PackedOption<T>
where T: UnwindSafe,

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,