Struct zvariant::Maybe

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pub struct Maybe<'a> { /* private fields */ }
Expand description

A helper type to wrap Option<T> (GVariant’s Maybe type) in Value.

API is provided to convert from, and to Option<T>.

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impl<'a> Maybe<'a>

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pub fn inner(&self) -> &Option<Value<'a>>

Get a reference to underlying value.

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pub fn just(value: Value<'a>) -> Self

Create a new Just (Some) Maybe.

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pub fn nothing<'s: 'a>(value_signature: Signature<'s>) -> Self

Create a new Nothing (None) Maybe, given the signature of the type.

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pub fn get<T>(&'a self) -> Result<Option<T>, Error>
where T: ?Sized + TryFrom<&'a Value<'a>>, <T as TryFrom<&'a Value<'a>>>::Error: Into<Error>,

Get the inner value as a concrete type

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pub fn signature(&self) -> Signature<'static>

Get the signature of Maybe.

NB: This method potentially allocates and copies. Use full_signature if you’d like to avoid that.

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pub fn full_signature(&self) -> &Signature<'_>

Get the signature of Maybe.

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pub fn value_signature(&self) -> &Signature<'_>

Get the signature of the potential value in the Maybe.

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pub fn try_clone(&self) -> Result<Self, Error>

Attempt to clone self.

Trait Implementations§

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impl<'a> Debug for Maybe<'a>

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

Formats the value using the given formatter. Read more
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impl Display for Maybe<'_>

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

Formats the value using the given formatter. Read more
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impl<'a, T> From<&Option<T>> for Maybe<'a>
where T: Type + Into<Value<'a>> + Clone,

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fn from(value: &Option<T>) -> Self

Converts to this type from the input type.
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impl<'a> From<Maybe<'a>> for Value<'a>

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fn from(v: Maybe<'a>) -> Self

Converts to this type from the input type.
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impl<'a, T> From<Option<T>> for Maybe<'a>
where T: Type + Into<Value<'a>>,

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fn from(value: Option<T>) -> Self

Converts to this type from the input type.
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impl<'a> Hash for Maybe<'a>

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

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<'a> Ord for Maybe<'a>

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fn cmp(&self, other: &Maybe<'a>) -> 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<'a> PartialEq for Maybe<'a>

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fn eq(&self, other: &Maybe<'a>) -> 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<'a> PartialOrd for Maybe<'a>

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fn partial_cmp(&self, other: &Maybe<'a>) -> 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<'a> Serialize for Maybe<'a>

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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<'a> TryFrom<&'a Maybe<'a>> for Value<'a>

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(v: &'a Maybe<'a>) -> Result<Self>

Performs the conversion.
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impl<'a> TryFrom<&'a OwnedValue> for &'a Maybe<'a>

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(v: &'a OwnedValue) -> Result<Self, Self::Error>

Performs the conversion.
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impl<'a> TryFrom<&'a Value<'_>> for &'a Maybe<'a>

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: &'a Value<'_>) -> Result<Self, Self::Error>

Performs the conversion.
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impl<'a> TryFrom<&Value<'a>> for Maybe<'a>

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: &Value<'a>) -> Result<Self, Self::Error>

Performs the conversion.
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impl<'a> TryFrom<Maybe<'a>> for OwnedValue

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(v: Maybe<'a>) -> Result<Self>

Performs the conversion.
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impl TryFrom<OwnedValue> for Maybe<'static>

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(v: OwnedValue) -> Result<Self, Self::Error>

Performs the conversion.
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impl<'a> TryFrom<Value<'a>> for Maybe<'a>

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: Value<'a>) -> Result<Self, Self::Error>

Performs the conversion.
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impl<'a> Eq for Maybe<'a>

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impl<'a> StructuralPartialEq for Maybe<'a>

Auto Trait Implementations§

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impl<'a> Freeze for Maybe<'a>

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impl<'a> RefUnwindSafe for Maybe<'a>

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impl<'a> Send for Maybe<'a>

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impl<'a> Sync for Maybe<'a>

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impl<'a> Unpin for Maybe<'a>

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impl<'a> UnwindSafe for Maybe<'a>

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> 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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. 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.